Remove Travis badge

[imjasonh]

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[codecov-commenter]

Codecov Report

Merging #452 (83c3f95) into main (2adcadd) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #452   +/-   ##
=======================================
  Coverage   53.25%   53.25%           
=======================================
  Files          36       36           
  Lines        1842     1842           
=======================================
  Hits          981      981           
  Misses        710      710           
  Partials      151      151           

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