Add User-Agent

[Thetwam]

Proposed Changes

• Add a default User-Agent header

Fixes #706

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (d98c4b8) to head (ea00a36).

Additional details and impacted files

@@            Coverage Diff            @@
##           develop      #707   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           75        75           
  Lines         3800      3803    +3     
=========================================
+ Hits          3800      3803    +3     

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