README.md in omniauth-twitter-1.2.1 vs README.md in omniauth-twitter-1.3.0

- old
+ new

@@ -154,10 +154,12 @@
 
 [![RailsCast #241](http://railscasts.com/static/episodes/stills/241-simple-omniauth-revised.png "RailsCast #241 - Simple OmniAuth (revised)")](http://railscasts.com/episodes/241-simple-omniauth-revised)
 
 ## Supported Rubies
 
-OmniAuth Twitter is tested under 1.9.3, 2.0.0, 2.1.x, 2.2.x, JRuby, and Rubinius.
+OmniAuth Twitter is tested under 2.1.x, 2.2.x and JRuby.
+
+If you use its gem on ruby 1.9.x, 2.0.x, or Rubinius use version v1.2.1 .
 
 ## Contributing
 
 Please read the [contribution guidelines](CONTRIBUTING.md) for some information on how to get started. No contribution is too small.
 