Add fastparse-cats to the list of projects

[johnynek]

These instances could be useful for someone working with fastparse. Hoping to reach a wider audience.

[codecov-io]

Codecov Report

Merging #2247 into master will increase coverage by 0.3%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #2247     +/-   ##
=========================================
+ Coverage   94.65%   94.95%   +0.3%     
=========================================
  Files         333      333             
  Lines        5777     5787     +10     
  Branches      217      222      +5     
=========================================
+ Hits         5468     5495     +27     
+ Misses        309      292     -17

Impacted Files	Coverage Δ
laws/src/main/scala/cats/laws/MonadLaws.scala	100% <0%> (ø)	⬆️
core/src/main/scala/cats/data/Ior.scala	98.48% <0%> (+0.01%)	⬆️
core/src/main/scala/cats/Eval.scala	98.75% <0%> (+0.04%)	⬆️
core/src/main/scala/cats/data/IorT.scala	97.76% <0%> (+0.05%)	⬆️
core/src/main/scala/cats/syntax/either.scala	99.16% <0%> (+14.16%)	⬆️

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