Added gemspec of digest library.
standalone repository is https://github.com/ruby/digest [Misc #13771][ruby-core:82179]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59607 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Added by hsbt (Hiroshi SHIBATA) about 8 years ago
Added gemspec of digest library.
standalone repository is https://github.com/ruby/digest
[Misc #13771][ruby-core:82179]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59607 b2dd03c8-39d4-4d8f-98ff-823fe69b080e