Remove unnecessary semicolons

[kun-song]

Remove unnecessary semicolons for small improvements.

[codecov-io]

Codecov Report

Merging #2451 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #2451   +/-   ##
=======================================
  Coverage   95.29%   95.29%           
=======================================
  Files         351      351           
  Lines        6371     6371           
  Branches      286      286           
=======================================
  Hits         6071     6071           
  Misses        300      300

Impacted Files	Coverage Δ
core/src/main/scala/cats/data/Chain.scala	99.54% <100%> (ø)	⬆️
...nel/src/main/scala/cats/kernel/instances/map.scala	100% <100%> (ø)	⬆️
core/src/main/scala/cats/instances/sortedMap.scala	96.87% <100%> (ø)	⬆️

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[ceedubs]

Thanks, @satansk!