README.md in mongoid-7.1.8 vs README.md in mongoid-7.1.9

@@ -15,10 +15,10 @@
 Compatibility
 -------------
 
 Mongoid supports and is tested against:
 
-- MRI 2.3-2.7
+- MRI 2.3-3.0
 - JRuby 9.2
 - MongoDB server 2.6-4.4
 
 Issues
 ------