update dev dependencies

package.json

@@ -52,13 +52,13 @@
     "visualization"
   ],
   "devDependencies": {
-    "@babel/core": "^7.4.4",
-    "@babel/preset-env": "^7.4.4",
+    "@babel/core": "^7.4.5",
+    "@babel/preset-env": "^7.4.5",
     "@babel/register": "^7.4.4",
     "babel-eslint": "^10.0.1",
-    "babel-loader": "^8.0.5",
+    "babel-loader": "^8.0.6",
     "babel-plugin-add-module-exports": "^1.0.2",
-    "babel-plugin-istanbul": "^5.1.3",
+    "babel-plugin-istanbul": "^5.1.4",
     "babel-plugin-transform-class-properties": "^6.24.1",
     "date-fns": "^1.30.1",
     "debounce": "^1.2.0",
@@ -70,8 +70,8 @@
     "esdoc-integrate-test-plugin": "^1.0.0",
     "esdoc-standard-plugin": "^1.0.0",
     "eslint": "^5.16.0",
-    "eslint-config-prettier": "^4.2.0",
-    "eslint-plugin-prettier": "^3.0.1",
+    "eslint-config-prettier": "^4.3.0",
+    "eslint-plugin-prettier": "^3.1.0",
     "htmlhint": "^0.11.0",
     "in-publish": "^2.0.0",
     "jasmine-core": "^3.4.0",
@@ -84,14 +84,14 @@
     "karma-jasmine-matchers": "4.0.1",
     "karma-verbose-reporter": "0.0.6",
     "karma-webpack": "^4.0.0-rc.6",
-    "lint-staged": "^8.1.5",
+    "lint-staged": "^8.1.7",
     "load-script": "^1.0.0",
     "pre-commit": "^1.2.2",
-    "prettier": "^1.17.0",
-    "terser-webpack-plugin": "^1.2.3",
-    "webpack": "^4.30.0",
-    "webpack-cli": "^3.3.1",
-    "webpack-dev-server": "^3.3.1",
+    "prettier": "^1.17.1",
+    "terser-webpack-plugin": "^1.3.0",
+    "webpack": "^4.32.2",
+    "webpack-cli": "^3.3.2",
+    "webpack-dev-server": "^3.4.1",
     "webpack-merge": "^4.2.1"
   },
   "homepage": "https://github.com/katspaugh/wavesurfer.js",