build: Update dependencies and fix deprecated messages

- All the dev dependencies were updates in package.json.
- prepublish was replaced by prepare to fix "warn prepublish-on-install As of npm@5, `prepublish` scripts are deprecated" & "warn prepublish-on-install Use `prepare` for build steps and `prepublishOnly` for upload-only."
- node-sass was added in package.json and a require('node-sass') was added to Gruntfile.js since the new version of grunt-sass requires it (see: https://github.com/sindresorhus/grunt-sass/releases/tag/v3.0.0)

.travis.yml

@@ -5,7 +5,6 @@ node_js:
    - "10"
    - "8"
    - "8.10"
-   - "6"
 
 before_install: if [[ `npm -v` != 6* ]]; then npm i -g npm@6.4.1; fi
 

Gruntfile.js

@@ -8,6 +8,8 @@
 var path = require('path'),
     getCodeVersion = require('silvermine-serverless-utils/src/get-code-version');
 
+const sass = require('node-sass');
+
 module.exports = function(grunt) {
 
    var DEBUG = !!grunt.option('debug'),
@@ -70,6 +72,7 @@ module.exports = function(grunt) {
 
       sass: {
          options: {
+            implementation: sass,
             sourceMap: DEBUG,
             indentWidth: 3,
             outputStyle: DEBUG ? 'expanded' : 'compressed',

package.json

@@ -4,7 +4,7 @@
   "description": "video.js plugin for selecting a video quality or resolution",
   "main": "src/js/index.js",
   "scripts": {
-    "prepublish": "grunt build",
+    "prepare": "grunt build",
     "test": "./node_modules/.bin/istanbul cover ./node_modules/.bin/_mocha -- -R spec 'tests/**/*.test.js'"
   },
   "author": "Jeremy Thomerson",
@@ -25,32 +25,33 @@
   },
   "homepage": "https://github.com/silvermine/videojs-quality-selector#readme",
   "devDependencies": {
-    "@silvermine/eslint-config": "1.5.0",
+    "@silvermine/eslint-config": "2.2.1",
     "@silvermine/sass-lint-config": "1.1.0",
-    "autoprefixer": "7.1.1",
-    "coveralls": "3.0.2",
-    "eslint": "4.0.0",
+    "autoprefixer": "9.5.1",
+    "coveralls": "3.0.3",
+    "eslint": "5.16.0",
     "expect.js": "0.3.1",
-    "grunt": "1.0.3",
+    "grunt": "1.0.4",
     "grunt-browserify": "5.3.0",
-    "grunt-contrib-uglify": "3.0.1",
+    "grunt-contrib-uglify": "4.0.1",
     "grunt-contrib-watch": "1.1.0",
-    "grunt-eslint": "20.0.0",
-    "grunt-postcss": "0.8.0",
-    "grunt-sass": "2.0.0",
-    "grunt-sass-lint": "0.2.2",
+    "grunt-eslint": "21.0.0",
+    "grunt-postcss": "0.9.0",
+    "grunt-sass": "3.0.2",
+    "node-sass": "4.12.0",
+    "grunt-sass-lint": "0.2.4",
     "istanbul": "0.4.5",
-    "mocha": "5.2.0",
+    "mocha": "6.1.4",
     "mocha-lcov-reporter": "1.3.0",
-    "rewire": "2.5.2",
+    "rewire": "4.0.1",
     "silvermine-serverless-utils": "git+https://github.com/silvermine/serverless-utils.git#910f1149af824fc8d0fa840878079c7d3df0f414",
-    "sinon": "2.3.5"
+    "sinon": "7.3.2"
   },
   "peerDependencies": {
-    "video.js": ">= 6.0.0"
+    "video.js": ">=6.0.0"
   },
   "dependencies": {
     "class.extend": "0.9.2",
-    "underscore": "1.8.3"
+    "underscore": "1.9.1"
   }
 }