Rename branch from master to main

[dmcgowan]

containerd project repo renamed already as well

[codecov-commenter]

Codecov Report

Merging #76 (e5abf8b) into main (156e633) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #76   +/-   ##
=======================================
  Coverage   20.64%   20.64%           
=======================================
  Files           7        7           
  Lines         586      586           
=======================================
  Hits          121      121           
  Misses        429      429           
  Partials       36       36           

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