README.md in mongoid-7.2.6 vs README.md in mongoid-7.3.0

@@ -17,10 +17,10 @@
 Compatibility
 -------------
 
 Mongoid supports and is tested against:
 
-- MRI 2.3-3.0
+- MRI 2.3-2.7
 - JRuby 9.2
 - MongoDB server 2.6-4.4
 
 Issues
 ------