chore(package): update ts-loader to version 3.1.1

Closes #5

Author: greenkeeper[bot]

package.json

@@ -40,7 +40,7 @@
     "run-sequence": "^2.0.0",
     "style-loader": "^0.18.2",
     "ts-helper": "0.0.1",
-    "ts-loader": "^2.3.1",
+    "ts-loader": "^3.1.1",
     "typescript": "^2.4.2",
     "webpack": "^3.3.0",
     "webpack-dev-middleware": "^1.5.1",