Incorrect versioning and incompartibility with Ruby > 2.4

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Please use 3 numbers for coding the version instead of 4 as now - 2.1.0.3. 'gem' is not able to see that x.x.0.1 is newer than x.x.0
http://guides.rubygems.org/patterns/#semantic-versioning

I tried to install gem install sciruby-full on Ruby 2.5 (under OpenSUSE). It fails because of 2.1.0.3 version is not recognizable by the 'gem'. But 2.1.0 is not buildable with Ruby >= 2.4

I had fixed the issue locally by extracting dependencies of sciruby-full in a separate Gemfile with installing by bundle.