diff --git a/.travis.yml b/.travis.yml
index 3042af8f55..ecac6353df 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -57,8 +57,8 @@ matrix:
         - mkdir -p $HOME/.local/bin
         - export PATH=$HOME/.local/bin:$PATH
         - travis_retry curl -L https://www.stackage.org/stack/linux-x86_64 | tar xz --wildcards --strip-components=1 -C $HOME/.local/bin '*/stack'
-        # Install node 6; from https://github.com/nodejs/nan/blob/master/.travis.yml
-        - rm -rf ~/.nvm && git clone https://github.com/creationix/nvm.git ~/.nvm && (cd ~/.nvm && git checkout `git describe --abbrev=0 --tags`) && source ~/.nvm/nvm.sh && nvm install 7
+        # Install node 8; from https://github.com/nodejs/nan/blob/master/.travis.yml
+        - rm -rf ~/.nvm && git clone https://github.com/creationix/nvm.git ~/.nvm && (cd ~/.nvm && git checkout `git describe --abbrev=0 --tags`) && source ~/.nvm/nvm.sh && nvm install 8
         - npm install npm
         - mv node_modules npm
         - npm/.bin/npm --version
diff --git a/package-lock.json b/package-lock.json
index b4a86e6ca1..3e667fb9fd 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -546,8 +546,19 @@
       "integrity": "sha512-5teOsQWABXHHBFP9y3skS5P3d/WfWXpv3FUpy+LorMrNYaT9pI4oLMQX7jzQ2KklNpGpWHzdCXTDT2Y3XGlZBw==",
       "dev": true,
       "requires": {
-        "micromatch": "3.1.10",
-        "normalize-path": "2.1.1"
+        "micromatch": "^3.1.4",
+        "normalize-path": "^2.1.1"
+      },
+      "dependencies": {
+        "normalize-path": {
+          "version": "2.1.1",
+          "resolved": "https://registry.npmjs.org/normalize-path/-/normalize-path-2.1.1.tgz",
+          "integrity": "sha1-GrKLVW4Zg2Oowab35vogE3/mrtk=",
+          "dev": true,
+          "requires": {
+            "remove-trailing-separator": "^1.0.1"
+          }
+        }
       }
     },
     "aproba": {
@@ -666,9 +677,9 @@
       "dev": true
     },
     "async-each": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/async-each/-/async-each-1.0.1.tgz",
-      "integrity": "sha1-GdOGodntxufByF04iu28xW0zYC0=",
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/async-each/-/async-each-1.0.3.tgz",
+      "integrity": "sha512-z/WhQ5FPySLdvREByI2vZiTWwCnF0moMJ1hK9YQwDTHKh6I7/uSckMetoRGb5UBZPC1z0jlw+n/XCgjeH7y1AQ==",
       "dev": true
     },
     "asynckit": {
@@ -756,9 +767,9 @@
       "dev": true
     },
     "binary-extensions": {
-      "version": "1.12.0",
-      "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-1.12.0.tgz",
-      "integrity": "sha512-DYWGk01lDcxeS/K9IHPGWfT8PsJmbXRtRd2Sx72Tnb8pcYZQFF1oSDb8hJtS1vhp212q1Rzi5dUf9+nq0o9UIg==",
+      "version": "1.13.1",
+      "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-1.13.1.tgz",
+      "integrity": "sha512-Un7MIEDdUC5gNpcGDV97op1Ywk748MpHcFTHoYs6qnj1Z3j7I53VG3nwZhKzoBZmbdRNnb6WRdFlwl7tSDuZGw==",
       "dev": true
     },
     "binary-parser": {
@@ -915,25 +926,25 @@
       }
     },
     "buffer-alloc": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/buffer-alloc/-/buffer-alloc-1.1.0.tgz",
-      "integrity": "sha1-BVFNM78WVtNUDGhPZbEgLpDsowM=",
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/buffer-alloc/-/buffer-alloc-1.2.0.tgz",
+      "integrity": "sha512-CFsHQgjtW1UChdXgbyJGtnm+O/uLQeZdtbDo8mfUgYXCHSM1wgrVxXm6bSyrUuErEb+4sYVGCzASBRot7zyrow==",
       "dev": true,
       "requires": {
-        "buffer-alloc-unsafe": "0.1.1",
-        "buffer-fill": "0.1.1"
+        "buffer-alloc-unsafe": "^1.1.0",
+        "buffer-fill": "^1.0.0"
       }
     },
     "buffer-alloc-unsafe": {
-      "version": "0.1.1",
-      "resolved": "https://registry.npmjs.org/buffer-alloc-unsafe/-/buffer-alloc-unsafe-0.1.1.tgz",
-      "integrity": "sha1-/+H2dVHdBVc33iUzN7/oU9+rGmo=",
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/buffer-alloc-unsafe/-/buffer-alloc-unsafe-1.1.0.tgz",
+      "integrity": "sha512-TEM2iMIEQdJ2yjPJoSIsldnleVaAk1oW3DBVUykyOLsEsFmEc9kn+SFFPz+gl54KQNxlDnAwCXosOS9Okx2xAg==",
       "dev": true
     },
     "buffer-fill": {
-      "version": "0.1.1",
-      "resolved": "https://registry.npmjs.org/buffer-fill/-/buffer-fill-0.1.1.tgz",
-      "integrity": "sha512-YgBMBzdRLEfgxJIGu2wrvI2E03tMCFU1p7d1KhB4BOoMN0VxmTFjSyN5JtKt9z8Z9JajMHruI6SE25W96wNv7Q==",
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/buffer-fill/-/buffer-fill-1.0.0.tgz",
+      "integrity": "sha1-+PeLdniYiO858gXNY39o5wISKyw=",
       "dev": true
     },
     "buffer-from": {
@@ -955,9 +966,9 @@
       "dev": true
     },
     "cacache": {
-      "version": "12.0.3",
-      "resolved": "https://registry.npmjs.org/cacache/-/cacache-12.0.3.tgz",
-      "integrity": "sha512-kqdmfXEGFepesTuROHMs3MpFLWrPkSSpRqOw80RCflZXy/khxaArvFrQ7uJxSUduzAufc6G0g1VUCOZXxWavPw==",
+      "version": "12.0.4",
+      "resolved": "https://registry.npmjs.org/cacache/-/cacache-12.0.4.tgz",
+      "integrity": "sha512-a0tMB40oefvuInr4Cwb3GerbL9xTj1D5yg0T5xrjGCGyfvbxseIXX7BAO/u/hIXdafzOI5JC3wDwHyf24buOAQ==",
       "dev": true,
       "requires": {
         "bluebird": "3.7.2",
@@ -1074,30 +1085,29 @@
       }
     },
     "chokidar": {
-      "version": "2.0.4",
-      "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-2.0.4.tgz",
-      "integrity": "sha512-z9n7yt9rOvIJrMhvDtDictKrkFHeihkNl6uWMmZlmL6tJtX9Cs+87oK+teBx+JIgzvbX3yZHT3eF8vpbDxHJXQ==",
+      "version": "2.1.8",
+      "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-2.1.8.tgz",
+      "integrity": "sha512-ZmZUazfOzf0Nve7duiCKD23PFSCs4JPoYyccjUFF3aQkQadqBhfzhjkwBH2mNOG9cTBwhamM37EIsIkZw3nRgg==",
       "dev": true,
       "requires": {
-        "anymatch": "2.0.0",
-        "async-each": "1.0.1",
-        "braces": "2.3.2",
-        "fsevents": "1.2.9",
-        "glob-parent": "3.1.0",
-        "inherits": "2.0.3",
-        "is-binary-path": "1.0.1",
-        "is-glob": "4.0.0",
-        "lodash.debounce": "4.0.8",
-        "normalize-path": "2.1.1",
-        "path-is-absolute": "1.0.1",
-        "readdirp": "2.2.1",
-        "upath": "1.1.0"
+        "anymatch": "^2.0.0",
+        "async-each": "^1.0.1",
+        "braces": "^2.3.2",
+        "fsevents": "^1.2.7",
+        "glob-parent": "^3.1.0",
+        "inherits": "^2.0.3",
+        "is-binary-path": "^1.0.0",
+        "is-glob": "^4.0.0",
+        "normalize-path": "^3.0.0",
+        "path-is-absolute": "^1.0.0",
+        "readdirp": "^2.2.1",
+        "upath": "^1.1.1"
       }
     },
     "chownr": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/chownr/-/chownr-1.0.1.tgz",
-      "integrity": "sha1-4qdQQqlVGQi+vSW4Uj1fl2nXkYE=",
+      "version": "1.1.4",
+      "resolved": "https://registry.npmjs.org/chownr/-/chownr-1.1.4.tgz",
+      "integrity": "sha512-jJ0bqzaylmJtVnNgzTeSOs8DPavpbYgEr/b0YL8/2GO3xJEhInFmhKMUnEJQjZumK7KXGFhUy89PrsJWlakBVg==",
       "dev": true
     },
     "chrome-trace-event": {
@@ -1303,12 +1313,6 @@
         "delayed-stream": "1.0.0"
       }
     },
-    "commander": {
-      "version": "2.15.1",
-      "resolved": "https://registry.npmjs.org/commander/-/commander-2.15.1.tgz",
-      "integrity": "sha512-VlfT9F3V0v+jr4yxPc5gg9s62/fIVWsd2Bk2iD435um1NlGMYdVCq+MjcXnhYq2icNOizHr1kK+5TI6H0Hy0ag==",
-      "dev": true
-    },
     "commondir": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/commondir/-/commondir-1.0.1.tgz",
@@ -1517,6 +1521,15 @@
       "integrity": "sha512-N8vBdOa+DF7zkRrDCsaOXoCs/E2fJfx9B9MrKnnSiHNh4ws7eSys6YQE4KvT1cecKmOASYQBhbKjeuDD9lT81w==",
       "dev": true
     },
+    "define-properties": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/define-properties/-/define-properties-1.1.3.tgz",
+      "integrity": "sha512-3MqfYKj2lLzdMSf8ZIZE/V+Zuy+BgD6f164e8K2w7dgnpKArBDerGYpM46IYYcjnkdPNMjPk9A6VFB8+3SKlXQ==",
+      "dev": true,
+      "requires": {
+        "object-keys": "^1.0.12"
+      }
+    },
     "define-property": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/define-property/-/define-property-1.0.0.tgz",
@@ -1614,6 +1627,12 @@
         "minimalistic-crypto-utils": "1.0.1"
       }
     },
+    "emoji-regex": {
+      "version": "7.0.3",
+      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-7.0.3.tgz",
+      "integrity": "sha512-CwBLREIQ7LvYFB0WyRvwhq5N5qPhc6PMjD6bYggFlI5YyDgl+0vxq5VHbMOFqLg7hfWzmu8T5Z1QofhmTIhItA==",
+      "dev": true
+    },
     "emojis-list": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/emojis-list/-/emojis-list-2.1.0.tgz",
@@ -1655,6 +1674,36 @@
       "integrity": "sha1-Ck2uN9YA0VopukU9jvkg8YRDM/Y=",
       "dev": true
     },
+    "es-abstract": {
+      "version": "1.17.5",
+      "resolved": "https://registry.npmjs.org/es-abstract/-/es-abstract-1.17.5.tgz",
+      "integrity": "sha512-BR9auzDbySxOcfog0tLECW8l28eRGpDpU3Dm3Hp4q/N+VtLTmyj4EUN088XZWQDW/hzj6sYRDXeOFsaAODKvpg==",
+      "dev": true,
+      "requires": {
+        "es-to-primitive": "^1.2.1",
+        "function-bind": "^1.1.1",
+        "has": "^1.0.3",
+        "has-symbols": "^1.0.1",
+        "is-callable": "^1.1.5",
+        "is-regex": "^1.0.5",
+        "object-inspect": "^1.7.0",
+        "object-keys": "^1.1.1",
+        "object.assign": "^4.1.0",
+        "string.prototype.trimleft": "^2.1.1",
+        "string.prototype.trimright": "^2.1.1"
+      }
+    },
+    "es-to-primitive": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/es-to-primitive/-/es-to-primitive-1.2.1.tgz",
+      "integrity": "sha512-QCOllgZJtaUo9miYBcLChTUaHNjJF3PYs1VidD7AwiEj1kYxKeQTctLAezAOH5ZKRH0g2IgPn6KwB4IT8iRpvA==",
+      "dev": true,
+      "requires": {
+        "is-callable": "^1.1.4",
+        "is-date-object": "^1.0.1",
+        "is-symbol": "^1.0.2"
+      }
+    },
     "escape-string-regexp": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
@@ -1876,9 +1925,9 @@
       "dev": true
     },
     "figgy-pudding": {
-      "version": "3.5.1",
-      "resolved": "https://registry.npmjs.org/figgy-pudding/-/figgy-pudding-3.5.1.tgz",
-      "integrity": "sha512-vNKxJHTEKNThjfrdJwHc7brvM6eVevuO5nTj6ez8ZQ1qbXTvGthucRF7S4vf2cr71QVnT70V34v0S1DyQsti0w==",
+      "version": "3.5.2",
+      "resolved": "https://registry.npmjs.org/figgy-pudding/-/figgy-pudding-3.5.2.tgz",
+      "integrity": "sha512-0btnI/H8f2pavGMN8w40mlSKOfTK2SVJmBfBeVIj3kNw0swwgzyRq0d5TJVOwodFmtvpPeWPN/MCcfuWF0Ezbw==",
       "dev": true
     },
     "fill-range": {
@@ -1913,6 +1962,23 @@
         "locate-path": "3.0.0"
       }
     },
+    "flat": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/flat/-/flat-4.1.0.tgz",
+      "integrity": "sha512-Px/TiLIznH7gEDlPXcUD4KnBusa6kR6ayRUVcnEAbreRIuhkqow/mun59BuRXwoYk7ZQOLW1ZM05ilIvK38hFw==",
+      "dev": true,
+      "requires": {
+        "is-buffer": "~2.0.3"
+      },
+      "dependencies": {
+        "is-buffer": {
+          "version": "2.0.4",
+          "resolved": "https://registry.npmjs.org/is-buffer/-/is-buffer-2.0.4.tgz",
+          "integrity": "sha512-Kq1rokWXOPXWuaMAqZiJW4XxsmD9zGx9q4aePabbn3qCRGedtH7Cm+zV8WETitMfu1wdh+Rvd6w5egwSngUX2A==",
+          "dev": true
+        }
+      }
+    },
     "flush-write-stream": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/flush-write-stream/-/flush-write-stream-1.1.1.tgz",
@@ -1999,14 +2065,15 @@
       "dev": true
     },
     "fsevents": {
-      "version": "1.2.9",
-      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-1.2.9.tgz",
-      "integrity": "sha512-oeyj2H3EjjonWcFjD5NvZNE9Rqe4UW+nQBU2HNeKw0koVLEFIhtyETyAakeAM3de7Z/SW5kcA+fZUait9EApnw==",
+      "version": "1.2.12",
+      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-1.2.12.tgz",
+      "integrity": "sha512-Ggd/Ktt7E7I8pxZRbGIs7vwqAPscSESMrCSkx2FtWeqmheJgCo2R74fTsZFCifr0VTPwqRpPv17+6b8Zp7th0Q==",
       "dev": true,
       "optional": true,
       "requires": {
-        "nan": "2.14.0",
-        "node-pre-gyp": "0.12.0"
+        "bindings": "^1.5.0",
+        "nan": "^2.12.1",
+        "node-pre-gyp": "*"
       },
       "dependencies": {
         "abbrev": {
@@ -2041,6 +2108,13 @@
           "bundled": true,
           "dev": true
         },
+        "bindings": {
+          "version": "1.5.0",
+          "resolved": "https://registry.npmjs.org/bindings/-/bindings-1.5.0.tgz",
+          "integrity": "sha512-p2q/t/mhvuOj/UeLlV6566GD/guowlr0hHxClI0W9m7MWYkL1F0hLo+0Aexs9HSPCtR1SXQ0TD3MMKrXZajbiQ==",
+          "dev": true,
+          "optional": true
+        },
         "brace-expansion": {
           "version": "1.1.11",
           "bundled": true,
@@ -2051,7 +2125,7 @@
           }
         },
         "chownr": {
-          "version": "1.1.1",
+          "version": "1.1.4",
           "bundled": true,
           "dev": true,
           "optional": true
@@ -2078,7 +2152,7 @@
           "optional": true
         },
         "debug": {
-          "version": "4.1.1",
+          "version": "3.2.6",
           "bundled": true,
           "dev": true,
           "optional": true,
@@ -2105,12 +2179,12 @@
           "optional": true
         },
         "fs-minipass": {
-          "version": "1.2.5",
+          "version": "1.2.7",
           "bundled": true,
           "dev": true,
           "optional": true,
           "requires": {
-            "minipass": "2.3.5"
+            "minipass": "^2.6.0"
           }
         },
         "fs.realpath": {
@@ -2136,7 +2210,7 @@
           }
         },
         "glob": {
-          "version": "7.1.3",
+          "version": "7.1.6",
           "bundled": true,
           "dev": true,
           "optional": true,
@@ -2165,7 +2239,7 @@
           }
         },
         "ignore-walk": {
-          "version": "3.0.1",
+          "version": "3.0.3",
           "bundled": true,
           "dev": true,
           "optional": true,
@@ -2184,7 +2258,7 @@
           }
         },
         "inherits": {
-          "version": "2.0.3",
+          "version": "2.0.4",
           "bundled": true,
           "dev": true
         },
@@ -2217,12 +2291,12 @@
           }
         },
         "minimist": {
-          "version": "0.0.8",
+          "version": "1.2.5",
           "bundled": true,
           "dev": true
         },
         "minipass": {
-          "version": "2.3.5",
+          "version": "2.9.0",
           "bundled": true,
           "dev": true,
           "requires": {
@@ -2231,24 +2305,24 @@
           }
         },
         "minizlib": {
-          "version": "1.2.1",
+          "version": "1.3.3",
           "bundled": true,
           "dev": true,
           "optional": true,
           "requires": {
-            "minipass": "2.3.5"
+            "minipass": "^2.9.0"
           }
         },
         "mkdirp": {
-          "version": "0.5.1",
+          "version": "0.5.3",
           "bundled": true,
           "dev": true,
           "requires": {
-            "minimist": "0.0.8"
+            "minimist": "^1.2.5"
           }
         },
         "ms": {
-          "version": "2.1.1",
+          "version": "2.1.2",
           "bundled": true,
           "dev": true,
           "optional": true
@@ -2261,36 +2335,36 @@
           "optional": true
         },
         "needle": {
-          "version": "2.3.0",
+          "version": "2.3.3",
           "bundled": true,
           "dev": true,
           "optional": true,
           "requires": {
-            "debug": "4.1.1",
-            "iconv-lite": "0.4.24",
-            "sax": "1.2.4"
+            "debug": "^3.2.6",
+            "iconv-lite": "^0.4.4",
+            "sax": "^1.2.4"
           }
         },
         "node-pre-gyp": {
-          "version": "0.12.0",
+          "version": "0.14.0",
           "bundled": true,
           "dev": true,
           "optional": true,
           "requires": {
-            "detect-libc": "1.0.3",
-            "mkdirp": "0.5.1",
-            "needle": "2.3.0",
-            "nopt": "4.0.1",
-            "npm-packlist": "1.4.1",
-            "npmlog": "4.1.2",
-            "rc": "1.2.8",
-            "rimraf": "2.6.3",
-            "semver": "5.7.0",
-            "tar": "4.4.8"
+            "detect-libc": "^1.0.2",
+            "mkdirp": "^0.5.1",
+            "needle": "^2.2.1",
+            "nopt": "^4.0.1",
+            "npm-packlist": "^1.1.6",
+            "npmlog": "^4.0.2",
+            "rc": "^1.2.7",
+            "rimraf": "^2.6.1",
+            "semver": "^5.3.0",
+            "tar": "^4.4.2"
           }
         },
         "nopt": {
-          "version": "4.0.1",
+          "version": "4.0.3",
           "bundled": true,
           "dev": true,
           "optional": true,
@@ -2300,19 +2374,30 @@
           }
         },
         "npm-bundled": {
-          "version": "1.0.6",
+          "version": "1.1.1",
+          "bundled": true,
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "npm-normalize-package-bin": "^1.0.1"
+          }
+        },
+        "npm-normalize-package-bin": {
+          "version": "1.0.1",
           "bundled": true,
           "dev": true,
           "optional": true
         },
         "npm-packlist": {
-          "version": "1.4.1",
+          "version": "1.4.8",
           "bundled": true,
           "dev": true,
           "optional": true,
           "requires": {
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 }
diff --git a/package.json b/package.json
index 19ed7d023a..fedcc2a13a 100644
--- a/package.json
+++ b/package.json
@@ -21,7 +21,7 @@
   },
   "devDependencies": {
     "benchmark": "^2.1.4",
-    "mocha": "^5.2.0",
+    "mocha": "^7.1.1",
     "request": "^2.88.0",
     "serialport": "^6.2.0",
     "webpack": "^4.26.1",