Bump commander from 3.0.2 to 4.0.1

Bumps [commander](https://github.com/tj/commander.js) from 3.0.2 to 4.0.1.
- [Release notes](https://github.com/tj/commander.js/releases)
- [Changelog](https://github.com/tj/commander.js/blob/master/CHANGELOG.md)
- [Commits](tj/commander.js@v3.0.2...4.0.1)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

package.json

@@ -43,7 +43,7 @@
     "blueimp-md5": "^2.10.0",
     "classnames": "^2.2.5",
     "codemirror": "^5.36.0",
-    "commander": "~3.0.0",
+    "commander": "~4.0.1",
     "concurrently": "^5.0.0",
     "cross-env": "^6.0.2",
     "dragula": "^3.7.2",