Update babel-preset-env to version 1.5.1 🚀

[greenkeeperio-bot]

🚨🔥⚠️ Action required: Switch to the new Greenkeeper now! 🚨🔥⚠️
This version of Greenkeper will be shutdown on May 31st.
With Integrations first-class bot support landed on GitHub and we’ve rewritten Greenkeeper to take full advantage of it. Simpler setup, fewer pull-requests, faster than ever.

---

Hello lovely humans,

babel-preset-env just published its new version 1.5.1.

State	Update 🚀
Dependency	babel-preset-env
New version	1.5.1
Type	dependency

This version is not covered by your current version range.

Without accepting this pull request your project will work just like it did before. There might be a bunch of new features, fixes and perf improvements that the maintainers worked on for you though.

I recommend you look into these changes and try to get onto the latest version of babel-preset-env.
Given that you have a decent test suite, a passing build is a strong indicator that you can take advantage of these changes by merging the proposed change into your project. Otherwise this branch is a great starting point for you to work on the update.

Do you have any ideas how I could improve these pull requests? Did I report anything you think isn’t right?
Are you unsure about how things are supposed to work?

There is a collection of frequently asked questions and while I’m just a bot, there is a group of people who are happy to teach me new things. Let them know.

Good luck with your project ✨

You rock!

🌴

---

GitHub Release

v1.5.1 (2017-05-22)

🐛 Bug Fix

• Compile with loose mode (#322) (@existentialism)

---

The new version differs by 51 commits .

• 5ff37e3 1.5.1
• 86ce2db Update changelog for v1.5.1 [skip ci]
• cb11cb1 Compile with loose mode (#332)
• d937261 1.5.0
• 590bfb5 Update changelog for v1.5 [skip ci]
• ddea7c8 Merge pull request #321 from babel/backport-string-versions
• 6bc5326 Backport: use preset-env and remove flow-strip-types (#324)
• c7d0e17 Merge branch 'master' into backport-string-versions
• fd35519 Merge pull request #329 from babel/bump-electron
• 8fb2222 Use ensureDirSync in smoke test
• 58055c8 Support target versions as strings (#231)
• 78ed702 Bump electron-to-chromium
• abdbeec Tweak version mappings to match compat-table updates (#323)
• 0e917de Bump browserslist. (#319)
• 20ddb72 Bump compat-table (#307)

There are 51 commits in total. See the full diff.