Upgrade to Scala 2.13.0-RC2

[xerial]

• publish for Scala 2.13.0-RC2? typelevel/scalacheck#471 Scala 2.13.0-RC2 typelevel/scalacheck#473

[codecov]

Codecov Report

Merging #500 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #500   +/-   ##
=======================================
  Coverage   83.66%   83.66%           
=======================================
  Files         209      209           
  Lines        7942     7942           
  Branches      608      608           
=======================================
  Hits         6645     6645           
  Misses       1297     1297

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