Upgrade rollup to version 0.68.1

[depfu]

Here is everything you need to know about this upgrade. Please take a good look at what changed and the test results before merging this pull request.

What changed?

✳️ rollup (^0.66.1 → ^0.68.1) · Repo · Changelog

Release Notes

0.68.1

2018-12-19

Bug Fixes

• Fix an issue with UMD wrappers where a variable is used without being defined (#2600)

Pull Requests

• #2600: Fix UMD and IIFE wrapper issues and add comprehensive functional wrapper tests (@lukastaegert)

Commits

See the full diff on Github. The new version differs by 6 commits:

• 0.68.1
• Update changelog
• Fix UMD wrapper issues and refine wrappers (#2600)
• Update changelog
• Update changelog
• Update changelog

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[papandreou]

@depfu merge