Update build tools.

No change on dist outputs on rebuild.

Author: ryanelian

package.json

@@ -15,10 +15,10 @@
     "build": "webpack && webpack --config webpack.config.min.js"
   },
   "devDependencies": {
-    "ts-loader": "^4.0.1",
+    "ts-loader": "^4.1.0",
     "typescript": "^2.7.2",
-    "webpack": "^4.1.1",
-    "webpack-cli": "^2.0.10"
+    "webpack": "^4.2.0",
+    "webpack-cli": "^2.0.13"
   },
   "dependencies": {}
 }