fix: add url for compatibility with webpack@5 (#1598) (#1599)

Author: glenjamin

package-lock.json

@@ -51,6 +51,7 @@
     "spdy": "^4.0.0",
     "strip-ansi": "^3.0.0",
     "supports-color": "^5.1.0",
+    "url": "^0.11.0",
     "webpack-dev-middleware": "3.4.0",
     "webpack-log": "^2.0.0",
     "yargs": "12.0.2"