Update rollup-plugin-sourcemaps to version 0.4.0 🚀

[greenkeeperio-bot]

Hello lovely humans,

rollup-plugin-sourcemaps just published its new version 0.4.0.

State	Update 🚀
Dependency	rollup-plugin-sourcemaps
New version	0.4.0
Type	devDependency

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-plugin-sourcemaps.
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 48 commits .

• 2a26bb8 0.4.0
• bd1ba6a Update changelog for 0.4.0
• d56edd6 Merge pull request #20 from maxdavidson/no-runtime
• 51a577a Bump lowest supported Node version to 4.5.0
• b45df90 Refactor and add back comments
• 823f88a Ignore .DS_Store files
• a430538 Convert async functions and promises to callbacks
• 449e088 chore(package): update rollup to version 0.35.7 (#19)
• 5c07edc chore(package): update eslint-config-airbnb-base to version 7.0.0 (#11)
• afbd7d6 chore(package): update eslint-config-airbnb-base to version 6.0.0 (#10)
• e5158c9 0.3.7
• 8a65982 Update Travis config
• 55be90e Use babel-preset-latest
• b23981e Fix devDependency link in README
• 75fa738 Merge pull request #9 from maxdavidson/greenkeeper-babel-plugin-istanbul-2.0.0

There are 48 commits in total. See the full diff.

---

This pull request was created by greenkeeper.io.

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

[coveralls]

Coverage remained the same at 100.0% when pulling 7b2fa1e on greenkeeper-rollup-plugin-sourcemaps-0.4.0 into 987f475 on master.