README.md in opencensus-0.2.0 vs README.md in opencensus-0.2.1

- old
+ new

@@ -148,10 +148,10 @@
 
 ## About the library
 
 ### Supported Ruby Versions
 
-This library is supported on Ruby 2.0+.
+This library is supported on Ruby 2.2+.
 
 ### Versioning
 
 This library follows [Semantic Versioning](http://semver.org/).