chore(package): update fork-ts-checker-webpack-plugin to version 4.1.5

Closes #73

Author: greenkeeper[bot]

package.json

@@ -17,7 +17,7 @@
     "cross-env": "5.2.0",
     "css-loader": "2.1.1",
     "file-loader": "3.0.1",
-    "fork-ts-checker-webpack-plugin": "^1.3.3",
+    "fork-ts-checker-webpack-plugin": "^4.1.5",
     "html-loader": "0.5.5",
     "html-webpack-plugin": "^3.2.0",
     "jasmine-core": "^3.4.0",