Drop support for Node 6 and 8 (#616)

Drop support for Node 6 and 8

.travis.yml

@@ -1,7 +1,7 @@
 ---
 language: node_js
 node_js:
-  - "6"
+  - "10"
 
 addons:
   chrome: stable

package.json

@@ -60,11 +60,8 @@
     "release-it": "^12.2.1",
     "release-it-lerna-changelog": "^1.0.3"
   },
-  "resolutions": {
-    "**/engine.io": "~3.3.0"
-  },
   "engines": {
-    "node": "6.* || 8.* || >= 10.*"
+    "node": "10.* || >= 12.*"
   },
   "publishConfig": {
     "registry": "https://registry.npmjs.org"

yarn.lock

@@ -4061,17 +4061,17 @@ engine.io-parser@~2.1.0, engine.io-parser@~2.1.1:
     blob "0.0.4"
     has-binary2 "~1.0.2"
 
-engine.io@~3.2.0, engine.io@~3.3.0:
-  version "3.3.2"
-  resolved "https://registry.yarnpkg.com/engine.io/-/engine.io-3.3.2.tgz#18cbc8b6f36e9461c5c0f81df2b830de16058a59"
-  integrity sha512-AsaA9KG7cWPXWHp5FvHdDWY3AMWeZ8x+2pUVLcn71qE5AtAzgGbxuclOytygskw8XGmiQafTmnI9Bix3uihu2w==
+engine.io@~3.2.0:
+  version "3.2.1"
+  resolved "https://registry.yarnpkg.com/engine.io/-/engine.io-3.2.1.tgz#b60281c35484a70ee0351ea0ebff83ec8c9522a2"
+  integrity sha512-+VlKzHzMhaU+GsCIg4AoXF1UdDFjHHwMmMKqMJNDNLlUlejz58FCy4LBqB2YVJskHGYl06BatYWKP2TVdVXE5w==
   dependencies:
     accepts "~1.3.4"
     base64id "1.0.0"
     cookie "0.3.1"
     debug "~3.1.0"
     engine.io-parser "~2.1.0"
-    ws "~6.1.0"
+    ws "~3.3.1"
 
 ensure-posix-path@^1.0.0, ensure-posix-path@^1.0.1, ensure-posix-path@^1.0.2, ensure-posix-path@^1.1.0:
   version "1.1.1"
@@ -9610,13 +9610,6 @@ ws@~3.3.1:
     safe-buffer "~5.1.0"
     ultron "~1.1.0"
 
-ws@~6.1.0:
-  version "6.1.4"
-  resolved "https://registry.yarnpkg.com/ws/-/ws-6.1.4.tgz#5b5c8800afab925e94ccb29d153c8d02c1776ef9"
-  integrity sha512-eqZfL+NE/YQc1/ZynhojeV8q+H050oR8AZ2uIev7RU10svA9ZnJUddHcOUZTJLinZ9yEfdA2kSATS2qZK5fhJA==
-  dependencies:
-    async-limiter "~1.0.0"
-
 xdg-basedir@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/xdg-basedir/-/xdg-basedir-3.0.0.tgz#496b2cc109eca8dbacfe2dc72b603c17c5870ad4"