Upgrade all packages

package.json

@@ -1,7 +1,7 @@
 {
   "name": "elm-webpack-starter",
   "description": "Webpack setup for writing Elm apps",
-  "version": "0.8.6",
+  "version": "0.8.7",
   "license": "MIT",
   "author": "Peter Morawiec",
   "repository": {
@@ -15,24 +15,24 @@
     "reinstall": "npm i rimraf && rimraf node_modules && npm uninstall -g elm && npm i -g elm && npm i && elm package install"
   },
   "devDependencies": {
-    "autoprefixer": "^6.7.7",
+    "autoprefixer": "^7.1.6",
     "bootstrap-sass": "^3.3.7",
-    "copy-webpack-plugin": "^4.0.1",
-    "css-loader": "^0.27.3",
+    "copy-webpack-plugin": "^4.2.0",
+    "css-loader": "^0.28.7",
     "elm": "^0.18.0",
-    "elm-webpack-loader": "^4.3.0",
-    "extract-text-webpack-plugin": "^2.1.0",
-    "file-loader": "^0.10.1",
-    "html-webpack-plugin": "^2.28.0",
+    "elm-webpack-loader": "^4.4.0",
+    "extract-text-webpack-plugin": "^3.0.2",
+    "file-loader": "^1.1.5",
+    "html-webpack-plugin": "^2.30.1",
     "jquery": "^3.2.1",
-    "node-sass": "^4.5.1",
-    "postcss-loader": "^1.3.3",
-    "rimraf": "^2.6.1",
-    "sass-loader": "^6.0.3",
-    "style-loader": "^0.16.0",
-    "url-loader": "^0.5.8",
-    "webpack": "^2.3.1",
-    "webpack-dev-server": "^2.4.2",
-    "webpack-merge": "^4.1.0"
+    "node-sass": "^4.6.1",
+    "postcss-loader": "^2.0.8",
+    "rimraf": "^2.6.2",
+    "sass-loader": "^6.0.6",
+    "style-loader": "^0.19.0",
+    "url-loader": "^0.6.2",
+    "webpack": "^3.8.1",
+    "webpack-dev-server": "^2.9.4",
+    "webpack-merge": "^4.1.1"
   }
 }

postcss.config.js

@@ -0,0 +1,5 @@
+module.exports = {
+  plugins: {
+    'autoprefixer': {}
+  }
+}

webpack.config.js

@@ -40,11 +40,6 @@ var commonConfig = {
         }]
     },
     plugins: [
-        new webpack.LoaderOptionsPlugin({
-            options: {
-                postcss: [autoprefixer()]
-            }
-        }),
         new HtmlWebpackPlugin({
             template: 'src/static/index.html',
             inject: 'body',