Update rollup to version 0.27.1 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

rollup just published its new version 0.27.1, 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 rollup – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging :palm_tree:

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The new version differs by 119 commits .

• 1a4c45a -> v0.27.1
• 3f43f62 Merge pull request #696 from rollup/ignore-illegal-name-suggestions
• dc19f98 Merge pull request #695 from rollup/gh-692-redux
• 528b692 ensure name suggestions are legal identifiers
• 001901a undo non-string ID change (#692)
• b12db91 -> v0.27.0
• 0b27f06 Merge branch 'master' of https://github.com/rollup/rollup
• 74ea693 Merge pull request #693 from rollup/gh-689
• e21d8a3 oops
• 3264378 tidy up tests, squelch nuisance warnings
• fc648ea remove es6-promise. closes #689
• 977f409 Merge pull request #688 from rollup/gh-655
• 7a03bf0 Merge pull request #692 from rollup/non-string-ids
• 169ae35 allow resolved module IDs to be non-strings
• a3f2d17 Allow specifying multiple output targets.

There are 119 commits in total. See the full diff.

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