Ability to set API Key & API Key Secret manually

[EricFrancis12]

These changes enable setting Twitter API Key & API Key Secret manually, without removing any existing functionality.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.46%. Comparing base (8855f22) to head (256851b).
Report is 6 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #319      +/-   ##
==========================================
+ Coverage   84.41%   84.46%   +0.05%     
==========================================
  Files          97       97              
  Lines        2630     2640      +10     
==========================================
+ Hits         2220     2230      +10     
  Misses        381      381              
  Partials       29       29              

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[EricFrancis12]

@michimani Thanks for your review.

I corrected the capitalization.

Also, it looks like SetAPIKey() and SetAPIKeySecret() are not needed after all, as authorize() is only called inside of NewClient(). So I removed them from the PR.

[michimani]

@EricFrancis12

Thank you for your pull request for additional features!

I will merge this PR and incorporate it into the next version.

Once again, thank you for your contribution!