Document Ruby 2.2 requirement

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Hongli Lai (Phusion) 2015-06-24 09:26:34 +02:00
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@ -8,6 +8,8 @@ This Ruby extension implements the SHA-3 ([Keccak](http://keccak.noekeon.org/))
gem install digest-sha3
**Note**: as of version 1.1.0, digest-sha3 requires Ruby 2.2. The last version that worked on older versions was 1.1.0.
Our gem is signed using PGP with the [Phusion Software Signing key](http://www.phusion.nl/about/gpg). That key in turn is signed by [the rubygems-openpgp Certificate Authority](http://www.rubygems-openpgp-ca.org/).
You can verify the authenticity of the gem by following [The Complete Guide to Verifying Gems with rubygems-openpgp](http://www.rubygems-openpgp-ca.org/blog/the-complete-guide-to-verifying-gems-with-rubygems-openpgp.html).