README.md in morph-0.5.1 vs README.md in morph-0.6.0

- old
+ new

@@ -12,10 +12,10 @@
 
 ```rb
     require 'morph'
 ```
 
-Tested to work with Ruby 1.8 - 2.3, JRuby 9, and Rubinius 3.
+Tested to work with Ruby 2.2 - 2.6.
 
 ## Morph creating classes `from_json`
 
 Here's an example showing Morph creating classes and objects from JSON:
 