bump version to 4.1.5

[coveralls]

Pull Request Test Coverage Report for Build 114

• 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 ?%

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Totals
Change from base Build 112:	0%
Covered Lines:
Relevant Lines:	0

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💛 - Coveralls

[g-k]

Still need a way to patch https://github.com/advisories/GHSA-7fhm-mqm4-2wp7 for minimist but GH can't generate a PR and npm doesn't have an advisory for it.

Paths (all dev deps):

• grunt@1.0.4 > dateformat@1.0.12 > minimist@1.2.0
• grunt@1.0.4 > mkdirp@0.5.1 > minimist@0.0.8
• nyc@14.1.1 > istanbul-reports@2.2.6 > handlebars@4.5.3 > optimist@0.6.1 > minimist@0.0.10
• tap@14.2.1 > coveralls@3.0.3 > minimist@1.2.0