build: update dependencies

Author: robertoachar

package.json

@@ -27,23 +27,23 @@
     "normalize.css": "8.0.0"
   },
   "devDependencies": {
-    "autoprefixer": "8.6.3",
+    "autoprefixer": "9.0.0",
     "babel-core": "6.26.3",
-    "babel-loader": "7.1.4",
+    "babel-loader": "7.1.5",
     "babel-preset-env": "1.7.0",
     "clean-webpack-plugin": "0.1.19",
-    "css-loader": "0.28.11",
+    "css-loader": "1.0.0",
     "eslint": "5.0.0",
     "eslint-config-prettier": "2.9.0",
-    "eslint-plugin-prettier": "2.6.1",
+    "eslint-plugin-prettier": "2.6.2",
     "file-loader": "1.1.11",
     "html-loader": "0.5.5",
     "html-webpack-plugin": "3.2.0",
     "image-webpack-loader": "4.3.1",
-    "mini-css-extract-plugin": "0.4.0",
-    "optimize-css-assets-webpack-plugin": "4.0.2",
+    "mini-css-extract-plugin": "0.4.1",
+    "optimize-css-assets-webpack-plugin": "5.0.0",
     "postcss-loader": "2.1.5",
-    "prettier": "1.13.6",
+    "prettier": "1.13.7",
     "style-loader": "0.21.0",
     "uglifyjs-webpack-plugin": "1.2.7",
     "webpack": "4.12.1",