chore: Bump file-loader and css optimizer webpack plugin

package.json

@@ -52,7 +52,7 @@
     "execa": "^1.0.0",
     "expect.js": "~0.2.0",
     "expose-loader": "0.7.5",
-    "file-loader": "^1.1.11",
+    "file-loader": "^3.0.1",
     "fork-ts-checker-webpack-plugin": "^1.0.0",
     "gaze": "^1.1.2",
     "glob": "~7.0.0",
@@ -86,7 +86,7 @@
     "ngtemplate-loader": "^2.0.1",
     "node-sass": "^4.11.0",
     "npm": "^5.4.2",
-    "optimize-css-assets-webpack-plugin": "^4.0.2",
+    "optimize-css-assets-webpack-plugin": "^5.0.1",
     "ora": "^3.1.0",
     "phantomjs-prebuilt": "^2.1.15",
     "postcss-browser-reporter": "^0.5.0",