Bump commander from 3.0.2 to 4.0.0 (#4)

Bumps [commander](https://github.com/tj/commander.js) from 3.0.2 to 4.0.0.
- [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...v4.0.0)

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

package.json

@@ -44,7 +44,7 @@
     "typescript": "^3.0.0"
   },
   "dependencies": {
-    "commander": "^3.0.2",
+    "commander": "^4.0.0",
     "cross-spawn": "^7.0.1",
     "execa": "^3.2.0",
     "glob": "^7.0.5"