Update build tools, configure webpack polling

package.json

@@ -1,12 +1,12 @@
 {
   "name": "epevents",
   "description": "EP Reisen TYPO3 website package",
-  "version": "3.0.0",
+  "version": "4.0.0",
   "author": "Björn Fromme, [email protected]",
   "license": "WTFPL",
   "repository": "https://gitlab.com/dreipunktnull/ep_theme.git",
   "scripts": {
-    "dev": "./node_modules/.bin/encore dev --watch --watch-poll 500",
+    "dev": "./node_modules/.bin/encore dev --watch",
     "build": "./node_modules/.bin/encore production"
   },
   "dependencies": {
@@ -33,10 +33,10 @@
     "vuex": "^3.1.0"
   },
   "devDependencies": {
+    "@babel/plugin-proposal-object-rest-spread": "^7.8.3",
+    "@babel/plugin-syntax-dynamic-import": "^7.8.3",
     "@symfony/webpack-encore": "^0.28.2",
     "autoprefixer": "^8.6.5",
-    "babel-plugin-syntax-dynamic-import": "^6.18.0",
-    "babel-plugin-transform-object-rest-spread": "^6.26.0",
     "node-sass": "^4.11.0",
     "postcss-loader": "^3.0.0",
     "sass-loader": "^7.3.1",
@@ -45,6 +45,6 @@
   },
   "browserslist": [
     "last 2 versions",
-    "ios >= 8"
+    "ios >= 9"
   ]
 }