Call signal.Stop when signalReceivers is stopped

[MarcoPolo]

fixes #1197

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.46%. Comparing base (696ed9a) to head (0cc6047).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1198      +/-   ##
==========================================
- Coverage   98.49%   98.46%   -0.04%     
==========================================
  Files          34       34              
  Lines        2858     2665     -193     
==========================================
- Hits         2815     2624     -191     
+ Misses         36       34       -2     
  Partials        7        7              

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[JacobOaks]

Thanks for the PR! I think this makes sense to me. Just one small question.