[readme] remove deprecated travis ci badge

[trajan0x]

removes deprecated travis CI badge

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.03%. Comparing base (882bd4d) to head (9300d49).

❗ Current head 9300d49 differs from pull request most recent head 0be7ea9

Please upload reports for the commit 0be7ea9 to get more accurate results.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #995   +/-   ##
=======================================
  Coverage   99.03%   99.03%           
=======================================
  Files         107      107           
  Lines        1651     1651           
  Branches      581      581           
=======================================
  Hits         1635     1635           
  Misses         16       16           

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[ljharb]

thanks! i've tweaked this to replace it with a github actions badge instead of just removing it