Add Read Ruby.

10 years ago · ea1c53ab51
parent e8bf481d28
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--- a/free-programming-books.md
+++ b/free-programming-books.md
@ -1568,6 +1568,7 @@ See also [TeX](#tex)
 * [Mr. Neighborly's Humble Little Ruby Book](http://www.humblelittlerubybook.com/)
 * [Practicing Ruby](https://github.com/elm-city-craftworks/practicing-ruby-manuscripts)
 * [Programming Ruby](http://www.ruby-doc.org/docs/ProgrammingRuby/)
+* [Read Ruby](http://readruby.io/)
 * [Ruby Essentials](http://www.techotopia.com/index.php/Ruby_Essentials)
 * [Ruby Hacking Guide](http://ruby-hacking-guide.github.io/)
 * [Ruby in Twenty Minutes](https://www.ruby-lang.org/en/documentation/quickstart/)