feat: Add epilog= field on commands for text which should go after the argument help.

[DanCardin]

Fixes #262

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.55%. Comparing base (c99f51b) to head (ae09bc1).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #264   +/-   ##
=======================================
  Coverage   99.55%   99.55%           
=======================================
  Files          28       28           
  Lines        2930     2934    +4     
  Branches      656      657    +1     
=======================================
+ Hits         2917     2921    +4     
  Misses         11       11           
  Partials        2        2           

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