Bump whatwg-fetch from 2.0.4 to 3.0.0

Bumps [whatwg-fetch](https://github.com/github/fetch) from 2.0.4 to 3.0.0.
- [Release notes](https://github.com/github/fetch/releases)
- [Commits](JakeChampion/fetch@v2.0.4...v3.0.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

package-lock.json

@@ -96,6 +96,6 @@
     "webpack": "^4.41.0",
     "webpack-cli": "^3.3.9",
     "webpack-dev-server": "^3.8.1",
-    "whatwg-fetch": "^2.0.4"
+    "whatwg-fetch": "^3.0.0"
   }
 }