Update scala 2.13.0-M5 to 2.13.0-RC1

[Philippus]

No description provided.

[Philippus]

I see errors in scala 2.11.x versions:https://travis-ci.org/Philippus/bump/jobs/516426652

SemVer.nextStable removes pre-release information if available: Exception raised on property evaluation.
[info] > Exception: java.lang.AbstractMethodError: nl.gn0s1s.bump.SemVerParser$.scala$util$parsing$combinator$Parsers$$lastNoSuccessVar()Lscala/util/DynamicVariable;

Looks like scala/scala-parser-combinators#108 after testing locally.

Scala 2.12 and 2.13.0-RC1 are ok.

[codecov-io]

Codecov Report

Merging #8 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master     #8   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           2      2           
  Lines          69     69           
  Branches        4      4           
=====================================
  Hits           69     69

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