Create alias for save method

[dr-rodriguez]

There was already a db.save_db alias, but I went ahead and added a new db.save one based on the issue. Also updated the test to confirm it works.

Closes #95

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.35%. Comparing base (05f7b5d) to head (164e693).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #98   +/-   ##
=======================================
  Coverage   95.35%   95.35%           
=======================================
  Files          10       10           
  Lines        1119     1120    +1     
=======================================
+ Hits         1067     1068    +1     
  Misses         52       52           

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