Update dependency worker-loader to v3

Author: renovate-bot

package-lock.json

@@ -32,6 +32,6 @@
     "progress-bar-webpack-plugin": "1.12.1",
     "webpack": "4.41.1",
     "webpack-cli": "3.0.8",
-    "worker-loader": "2.0.0"
+    "worker-loader": "3.0.2"
   }
 }