Sleep for one second before every "mutative" request (POST, PATCH, PUT, or DELETE)

[DilumAluthge]

Replacement for #234
Fixes #232

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From the GitHub docs:

Pause between mutative requests

If you are making a large number of POST, PATCH, PUT, or DELETE requests, wait at least one second between each request. This will help you avoid secondary rate limits.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.53%. Comparing base (97e94e4) to head (c6ef3de).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #258      +/-   ##
==========================================
+ Coverage   58.45%   58.53%   +0.08%     
==========================================
  Files          37       37              
  Lines         982      984       +2     
==========================================
+ Hits          574      576       +2     
  Misses        408      408              

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