Merge pull request #148 from Demivan/gulp-4

Update gulp to version 4

src/js/tsconfig.json

@@ -54,5 +54,5 @@
         // "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
         // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
         "resolveJsonModule": true
-    },
+    }
 }