[ruby-cvs:70651] hsbt:r63560 (trunk): Promote Prime library to default gems.

[hsbt at ruby-lang.org]

hsbt	2018-06-03 08:05:45 +0900 (Sun, 03 Jun 2018)

  New Revision: 63560

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=63560

  Log:
    Promote Prime library to default gems.
    
      * Its upstream is https://github.com/ruby/prime.

  Added files:
    trunk/lib/prime.gemspec
  Modified files:
    trunk/doc/maintainers.rdoc
    trunk/doc/standard_library.rdoc
    trunk/lib/prime.rb