Add test for debian bttracker

[dampcake]

Closes #10

As far as I can tell it outputs valid bencode now. Just pulled from the URL and was able to decode it no problem.

Also fixes deprecation warnings.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.61%. Comparing base (bd30fa2) to head (ecdef57).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main      #18   +/-   ##
=========================================
  Coverage     98.61%   98.61%           
  Complexity       98       98           
=========================================
  Files             7        7           
  Lines           217      217           
  Branches         31       31           
=========================================
  Hits            214      214           
  Partials          3        3           

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