build(deps): bump commander from 4.1.1 to 6.1.0

Bumps [commander](https://github.com/tj/commander.js) from 4.1.1 to 6.1.0.
- [Release notes](https://github.com/tj/commander.js/releases)
- [Changelog](https://github.com/tj/commander.js/blob/master/CHANGELOG.md)
- [Commits](tj/commander.js@v4.1.1...v6.1.0)

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

Author: dependabot-preview[bot]

package-lock.json

@@ -69,7 +69,7 @@
   "dependencies": {
     "boolean": "3.0.1",
     "chalk": "3.0.0",
-    "commander": "4.1.1",
+    "commander": "6.1.0",
     "fs-extra": "8.1.0",
     "glob": "7.1.6",
     "lodash": "4.17.20",