Do not fail CI if codecov falls

[jakobnissen]

Now, codecov no longer fails PRs. They are merely informative.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (b4f5970) 91.01% compared to head (de07f99) 83.63%.
Report is 2 commits behind head on master.

❗ Current head de07f99 differs from pull request most recent head c2bfb6c. Consider uploading reports for the commit c2bfb6c to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #291      +/-   ##
==========================================
- Coverage   91.01%   83.63%   -7.38%     
==========================================
  Files          31       31              
  Lines        2392     2383       -9     
==========================================
- Hits         2177     1993     -184     
- Misses        215      390     +175     

Flag	Coverage Δ
unittests	83.63% <80.00%> (-7.38%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
src/longsequences/seqview.jl	100.00% <100.00%> (ø)
src/geneticcode.jl	37.16% <50.00%> (-43.37%)	⬇️

... and 6 files with indirect coverage changes

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