Add User agent

[cnovel]

Fixes 403s for some podcast providers.

Fixes #76

[pep8speaks]

Hello @cnovel! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

There are currently no PEP 8 issues detected in this Pull Request. Cheers! 🍻

Comment last updated at 2024-07-21 07:55:34 UTC

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.79%. Comparing base (df219f4) to head (c60cb49).
Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #78      +/-   ##
==========================================
- Coverage   90.07%   89.79%   -0.29%     
==========================================
  Files           7        7              
  Lines         665      676      +11     
==========================================
+ Hits          599      607       +8     
- Misses         66       69       +3     

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