v0.3.0 release

[wang-boyu]

For #85.

• add v0.3.0 release notes
• update version number from 0.2.0 to 0.3.0

[codecov]

Codecov Report

Merging #95 (8fa064d) into main (00cfc35) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #95   +/-   ##
=======================================
  Coverage   79.28%   79.28%           
=======================================
  Files           7        7           
  Lines         584      584           
  Branches       98       98           
=======================================
  Hits          463      463           
  Misses        105      105           
  Partials       16       16           

Impacted Files	Coverage Δ
mesa_geo/__init__.py	100.00% <100.00%> (ø)

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