removed duplicate requirement

[gregorypease280]

"mock" is included twice in the development requirements. This causes pip install to fail with

Double requirement given: mock (from -r requirements-development.txt (line 15)) (already in mock (from -r requirements-development.txt (line 5)), name='mock')

[mblayman]

Thanks! I guess there was a merge that got mixed up. 👍

[codecov-io]

Codecov Report

Merging #377 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #377   +/-   ##
========================================
  Coverage    93.05%   93.05%           
========================================
  Files           51       51           
  Lines         2665     2665           
========================================
  Hits          2480     2480           
  Misses         185      185

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