Append command checks version

[hyperrealist]

Closes #113

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.47%. Comparing base (fd780d5) to head (328c1b5).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #116   +/-   ##
=======================================
  Coverage   97.47%   97.47%           
=======================================
  Files          12       12           
  Lines        1226     1229    +3     
=======================================
+ Hits         1195     1198    +3     
  Misses         31       31           

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