Bump danger from 3.9.0 to 4.0.1 (#2090)

Bumps [danger](https://github.com/danger/danger-js) from 3.9.0 to 4.0.1.
- [Release notes](https://github.com/danger/danger-js/releases)
- [Changelog](https://github.com/danger/danger-js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/danger/danger-js/compare/3.9.0...4.0.1)

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

package.json

@@ -123,7 +123,7 @@
     "child-process-promise": "^2.2.1",
     "classnames": "^2.2.5",
     "concurrently": "^4.0.1",
-    "danger": "^3.7.13",
+    "danger": "^4.0.1",
     "danger-plugin-no-test-shortcuts": "^2.0.0",
     "dejavu-fonts-ttf": "^2.37.3",
     "eol": "^0.9.1",