Update rollup to version 0.26.3 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

rollup just published its new version 0.26.3, 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 80 commits .

• 8ee6ef0 -> v0.26.3
• 82112f7 ensure reference is only marked as reassignment if it is the subject of the reassignment – fixes #648
• f8a872c gah eslint
• 84ba808 update various dependencies
• b616db1 -> v0.26.2
• e3a58ec Merge pull request #634 from rollup/gh-632
• f18bf0f Merge pull request #640 from rollup/update-collapse-sourcemaps
• 1ae1cee Merge pull request #631 from rollup/gh-587
• cf5dee0 Update collapseSourcemaps to use class syntax post-620
• 126b22c Merge pull request #639 from Victorystick/fix-no-treeshake-vars
• 610f798 Missing trailing new-lines
• fbb0b39 Fix failing test
• e1286d3 Add failing test case, which results in "var var ..."
• a6d3436 fix test title
• d0ea2ad allow rewrites of variable declarator inits – fixes #632

There are 80 commits in total. See the full diff.

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