MAINT: tidy up and migrate to main

[mmcky]

Minor tidy and migrate to using main

• [x] change default branch name from main to master
• [x] merge after #45

[codecov-commenter]

Codecov Report

Merging #53 (dcde0ee) into master (92b9614) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #53   +/-   ##
=======================================
  Coverage   92.98%   92.98%           
=======================================
  Files           6        6           
  Lines         442      442           
=======================================
  Hits          411      411           
  Misses         31       31           

Flag	Coverage Δ
pytests	92.98% <ø> (ø)

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