update README. [ci skip]

apotonick · Nov 6, 2016 · c181719 · c181719
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diff --git a/README.md b/README.md
@@ -12,6 +12,8 @@ Add this line to your application's Gemfile:
 gem 'uber'
 ```
 
+Uber runs with Ruby >= 1.9.3.
+
 Ready?
 
 # Inheritable Class Attributes