Rename branch from master to main

[dmcgowan]

project repo has already been renamed as well

[codecov-commenter]

Codecov Report

Merging #86 (a143311) into main (9191ec9) will increase coverage by 0.98%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #86      +/-   ##
==========================================
+ Coverage   69.77%   70.75%   +0.98%     
==========================================
  Files          11       11              
  Lines         612      612              
==========================================
+ Hits          427      433       +6     
+ Misses        149      143       -6     
  Partials       36       36              

Impacted Files	Coverage Δ
client.go	82.80% <0.00%> (+3.82%)	⬆️

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