Fix various builds

[coveralls]

Pull Request Test Coverage Report for Build 1803490397

• 3 of 8 (37.5%) changed or added relevant lines in 1 file are covered.
• 2 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.04%) to 55.833%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
chroma_feedback/helper.py	3	8	37.5%
<!--	Total:	3	8	37.5%	-->

Files with Coverage Reduction	New Missed Lines	%
chroma_feedback/producer/appveyor/normalize.py	1	76.92%
chroma_feedback/producer/wercker/normalize.py	1	78.57%
<!--	Total:	2		-->

Totals
Change from base Build 1803264708:	-0.04%
Covered Lines:	1297
Relevant Lines:	2323

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💛 - Coveralls