Update babelify to version 6.4.0 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

babelify just published its new version 6.4.0, which is not covered by your current version range.

If this pull request passes your tests you can publish your software with the latest version of babelify – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging :palm_tree:

---

The new version differs by 5 commits .

• 7ef079b 6.4.0
• 6f46ff5 Merge pull request #124 from babel/emit-babelify-event
• f5f2cd2 Add "babelify" event
• 002918e Update deps & devDeps
• 1bea40b Add node 4.0 to travis test

See the full diff.

---

This pull request was created by greenkeeper.io. It keeps your software, up to date, all the time.

_{Tired of seeing this sponsor message? Upgrade to the supporter plan! You'll also get your pull requests faster :zap:}