use short date format in copyright header (katspaugh#1479)

* update dev dependencies

* use YYYY-MM-DD format

build-config/fragments/common.js

@@ -2,14 +2,15 @@
 
 const path = require('path');
 const webpack = require('webpack');
+const datefns = require('date-fns');
 
-const time = new Date();
-var rootDir = path.resolve(__dirname, '..', '..');
+const rootDir = path.resolve(__dirname, '..', '..');
 const pckg = require(path.join(rootDir, 'package.json'));
+const date = datefns.format(new Date(), 'YYYY-MM-DD');
 
 // add JS banner with copyright and version info
 // prettier-ignore
-const jsBanner = `${pckg.name} ${pckg.version} (${time})
+const jsBanner = `${pckg.name} ${pckg.version} (${date})
 ${pckg.homepage}
 @license ${pckg.license}`;
 const jsBannerPlugin = new webpack.BannerPlugin({

package.json

@@ -38,17 +38,24 @@
     "url": "https://github.com/katspaugh/wavesurfer.js/issues"
   },
   "keywords": [
-    "waveform", "audio", "music", "player", "webaudio", "microphone", "visualization"
+    "waveform",
+    "audio",
+    "music",
+    "player",
+    "webaudio",
+    "microphone",
+    "visualization"
   ],
   "devDependencies": {
-    "@babel/core": "^7.1.0",
+    "@babel/core": "^7.1.2",
     "@babel/preset-env": "^7.1.0",
     "@babel/register": "^7.0.0",
     "babel-eslint": "^10.0.1",
     "babel-loader": "^8.0.4",
     "babel-plugin-add-module-exports": "^1.0.0",
     "babel-plugin-istanbul": "^5.0.1",
     "babel-plugin-transform-class-properties": "^6.24.1",
+    "date-fns": "^1.29.0",
     "debounce": "^1.2.0",
     "esdoc": "^1.1.0",
     "esdoc-accessor-plugin": "^1.0.0",
@@ -60,7 +67,7 @@
     "eslint": "^5.6.1",
     "eslint-config-prettier": "^3.1.0",
     "eslint-loader": "^2.1.1",
-    "eslint-plugin-prettier": "^2.7.0",
+    "eslint-plugin-prettier": "^3.0.0",
     "htmlhint": "^0.10.1",
     "in-publish": "^2.0.0",
     "jasmine-core": "^3.2.1",
@@ -79,7 +86,7 @@
     "prettier": "^1.14.3",
     "uglifyjs-webpack-plugin": "^2.0.1",
     "webpack": "^4.20.2",
-    "webpack-cli": "^3.1.1",
+    "webpack-cli": "^3.1.2",
     "webpack-dev-server": "^3.1.9",
     "webpack-merge": "^4.1.4"
   },