Add changelog entry for 0.6.0

[blink1073]

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[codecov]

Codecov Report

Merging #41 (25df878) into master (4563ee7) will increase coverage by 0.35%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #41      +/-   ##
==========================================
+ Coverage   90.14%   90.49%   +0.35%     
==========================================
  Files           3        3              
  Lines         284      284              
==========================================
+ Hits          256      257       +1     
+ Misses         28       27       -1     

Impacted Files	Coverage Δ
pytest_check_links/plugin.py	92.68% <0.00%> (+0.40%)	⬆️

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