Upgrade assetgraph to version 6.4.0

[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?

✳️ assetgraph (6.3.0 → 6.4.0) · Repo

Commits

See the full diff on Github. The new version differs by 3 commits:

• 6.4.0
• populate: Support startAssets being passed as an asset instance or an array of asset instances
• prettier --write lib/assets/JavaScript.js

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[coveralls]

Pull Request Test Coverage Report for Build 315

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 88.889%

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Totals
Change from base Build 313:	0.0%
Covered Lines:	92
Relevant Lines:	99

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💛 - Coveralls