Ensure PyYAML greater than 4.2b1

[wroersma]

No description provided.

[codecov]

Codecov Report

Merging #1 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master     #1   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           1      1           
  Lines          21     21           
=====================================
  Hits           21     21

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[coveralls]

Pull Request Test Coverage Report for Build 16

• 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 36.567%

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Totals
Change from base Build 14:	0.0%
Covered Lines:	2578
Relevant Lines:	7050

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 16

• 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 36.567%

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Totals
Change from base Build 14:	0.0%
Covered Lines:	2578
Relevant Lines:	7050

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💛 - Coveralls