Update rollup to version 0.31.2 🚀

[greenkeeperio-bot]

Hello lovely humans,

rollup just published its new version 0.31.2.

State	Update 🚀
Dependency	rollup
New version	0.31.2
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 rollup.
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!

🌴

---

The new version differs by 13 commits .

• b3f6317 -> v0.31.2
• d3c2ee6 Merge pull request #715 from Permutatrix/plugin-load-sourcemap
• d9852e9 Merge pull request #718 from rollup/ghi-717
• 9b13711 update allowed options test
• c9d422d Allow sourceMapFile as an option.
• 3a2f9b6 Don't use endsWith. Will this fix the 0.12 build?
• e256ddb Removed debugging line in sourcemaps loaders test
• 2a7a1a7 Updated test for loader sourcemaps
• 7535c51 Fixed loading of source content from loader-provided sourcemaps
• 4ebaeec Reduce blobbiness of collapseSourcemaps
• 3f39f2a Simplify sourcemaps loaders test
• 22f57c4 Made it possible for plugin loaders to provide sourcemaps
• c6e360d const map = map? I think not.

See the full diff.

---

This pull request was created by greenkeeper.io.

_{Tired of seeing this sponsor message? ⚡ greenkeeper upgrade}