feat: updateAst.

[knightedcodemonkey]

• upgrades dependencies.
• upgrades supported node versions >= 20.
• add license.
• update docs.

BREAKING CHANGE:

• dropped support for node versions < 20.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.13%. Comparing base (69629a9) to head (0feffa5).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #20      +/-   ##
==========================================
+ Coverage   99.11%   99.13%   +0.02%     
==========================================
  Files           3        3              
  Lines         450      462      +12     
  Branches       58       58              
==========================================
+ Hits          446      458      +12     
  Misses          4        4              

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