guard against 0 too

Merge pull request #38 from jruby/dependabot/maven/junit-junit-4.13.1

Bump junit from 4.10 to 4.13.1

[maven-release-plugin] prepare for next development iteration

[maven-release-plugin] prepare release jcodings-1.0.55

Merge pull request #37 from k77ch7/fix-isInRange

[maven-release-plugin] prepare for next development iteration

[maven-release-plugin] prepare release jcodings-1.0.53

[maven-release-plugin] prepare release jcodings-1.0.53

Hardcode unicode and emoji version bits for now

[maven-release-plugin] prepare for next development iteration

[maven-release-plugin] prepare release jcodings-1.0.52

Merge pull request #36 from k77ch7/fix-cp50221-transcoder

[maven-release-plugin] prepare for next development iteration

[maven-release-plugin] prepare release jcodings-1.0.51

Merge pull request #34 from k77ch7/update-Econv

Merge pull request #35 from k77ch7/fix-getGB4bt2

[maven-release-plugin] prepare for next development iteration