Fix GitHub Actions badge in README

[fthomas]

No description provided.

[codecov-commenter]

Codecov Report

Base: 95.31% // Head: 95.31% // No change to project coverage 👍

Coverage data is based on head (c7dd124) compared to base (9d4c9f3).
Patch has no changes to coverable lines.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #362   +/-   ##
=======================================
  Coverage   95.31%   95.31%           
=======================================
  Files           6        6           
  Lines          64       64           
=======================================
  Hits           61       61           
  Misses          3        3           

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