readme: bump version to 0.6.0

[cakebaker]

I forgot to bump the version info in the readme when I did the release.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.00%. Comparing base (a05bd1d) to head (e1aa18d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #78      +/-   ##
==========================================
- Coverage   71.21%   70.00%   -1.22%     
==========================================
  Files           6        6              
  Lines         820      820              
  Branches      190      190              
==========================================
- Hits          584      574      -10     
  Misses        127      127              
- Partials      109      119      +10     

Flag	Coverage Δ
macos_latest	70.00% <ø> (ø)
ubuntu_latest	69.02% <ø> (ø)
windows_latest	7.62% <ø> (ø)

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