Upgrade optipng-bin to version 5.0.0

[depfu]

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

name	version specification	new version
optipng-bin	^4.0.0	5.0.0

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

What changed?

✳️ optipng-bin ( → 5.0.0) · Repo

Commits

See the full diff on Github. The new version differs by 2 commits:

• 5.0.0
• Require Node.js 6 (#102)

---

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[coveralls]

Coverage remained the same at 91.25% when pulling 393eb66 on depfu/update/npm/optipng-bin-5.0.0 into 26f0fd4 on master.