Update README.md

typo in version number
opentok · Feb 22, 2015 · 4ac4e7f · 4ac4e7f
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diff --git a/README.md b/README.md
@@ -32,7 +32,7 @@ $ bundle install
 ## RubyGems:
 
 ```
-$ gem install opentok -v 2.2.2
+$ gem install opentok -v 2.2.4
 ```
 
 # Usage