build(yarn): Upgrade Webpack tools

Force onsenui 2.10.4 because 2.10.5 uses FontAwesome 5 and it is not compatible with awesome-markers
(see lennardv2/Leaflet.awesome-markers#94)

package.json

@@ -5,9 +5,9 @@
   "author": "Pierre Rudloff",
   "bugs": "https://github.com/Rudloff/openvegemap/issues",
   "dependencies": {
-    "css-loader": "~0.28.7",
+    "css-loader": "~2.0.0",
     "drmonty-leaflet-awesome-markers": "~2.0.2",
-    "file-loader": "~1.1.5",
+    "file-loader": "~2.0.0",
     "i18n-postal-address": "~0.0.6",
     "i18next-client": "~1.11.4",
     "leaflet": "~1.3.0",
@@ -16,12 +16,12 @@
     "leaflet-loader": "~0.0.1",
     "leaflet-overpass-layer": "~2.8.0",
     "leaflet-plugins": "~3.0.0",
-    "onsenui": "~2.10.0",
+    "onsenui": "2.10.4",
     "opening_hours": "~3.5.0",
     "string.prototype.padstart": "~3.0.0",
-    "style-loader": "~0.21.0",
-    "webpack": "~4.10.2",
-    "webpack-cli": "~3.0.1"
+    "style-loader": "~0.23.1",
+    "webpack": "~4.27.1",
+    "webpack-cli": "~3.1.2"
   },
   "devDependencies": {
     "doxdox": "^2.0.3",

webpack.config.js

@@ -10,7 +10,7 @@ module.exports = {
         rules: [
             {
                 test: /\.css$/,
-                loader: ["style-loader", "css-loader?minimize=true"]
+                loader: ["style-loader", "css-loader"]
             },
             {
                 test: /\.(eot|svg|ttf|woff|woff2)$/,