Added stale bot

[iamrajiv]

Fixes: #349

[codecov-io]

Codecov Report

Merging #370 (1ba040e) into master (83ed827) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #370   +/-   ##
=======================================
  Coverage   73.50%   73.50%           
=======================================
  Files          41       41           
  Lines        1317     1317           
=======================================
  Hits          968      968           
  Misses        295      295           
  Partials       54       54           

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[johanbrandhorst]

Thanks for your contribution :).