Add option to matcher to ignore authorization header

[zhammer]

The suggestion in the readme to clear authorization headers in hooks isn't working for us; when we attempt to run against the recorded cassettes the match fails as the http.Request has an Authorization header that the cassette interaction doesn't.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 52.40%. Comparing base (1ae1a38) to head (23299c2).
⚠️ Report is 32 commits behind head on v4.
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Additional details and impacted files

@@            Coverage Diff             @@
##               v4     #103      +/-   ##
==========================================
+ Coverage   51.61%   52.40%   +0.79%     
==========================================
  Files           4        4              
  Lines         494      498       +4     
==========================================
+ Hits          255      261       +6     
+ Misses        218      217       -1     
+ Partials       21       20       -1     

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[dnaeon]

Thanks!