Upgrade sinon to version 6.3.5

[depfu]

We've upgraded a dependency and all tests pass. \o/

name	version specification	new version
sinon	^2.1.0	6.3.5

You should probably take a good look at this before merging this pull request, of course.

What changed?

✳️ sinon ( → 6.3.5) · Repo · Changelog

Commits

See the full diff on Github. The new version differs by 9 commits:

• 6.3.5
• Update History.md and AUTHORS for new release
• Upgrade lolex
• Upgrade @sinonjs/samsam
• Always print some diagnostics to stderr on error
• Improve webworker test script to output diagnostic data on failure
• test(1882): add test case (#1905)
• Update docs/changelog.md and set new release id in docs/_config.yml
• Add release documentation for v6.3.4

---

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[papandreou]

@depfu merge

[coveralls]

Coverage remained the same at 80.198% when pulling 37523e5 on depfu/update/npm/sinon-6.3.5 into 6744162 on master.