readme: fix link to codecov

[urld]

This reverts commit c22937d.

Signed-off-by: David Url david@urld.io

[codecov]

Codecov Report

Merging #2 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master       #2   +/-   ##
=======================================
  Coverage   89.93%   89.93%           
=======================================
  Files           2        2           
  Lines         159      159           
=======================================
  Hits          143      143           
  Misses         11       11           
  Partials        5        5

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[jessfraz]

thanks!