chore(deps): update dependency webpackbar to v4 (#1636)

Author: renovate[bot]

package.json

@@ -169,7 +169,7 @@
         "webpack-cli": "^3.2.1",
         "webpack-dev-server": "^3.1.14",
         "webpack-merge": "^4.1.1",
-        "webpackbar": "^3.1.5",
+        "webpackbar": "^4.0.0",
         "xhr-mock": "^2.5.1"
     },
     "dependencies": {