README.md in inky-rb-1.3.7.3 vs README.md in inky-rb-1.3.7.4

@@ -161,6 +161,6 @@
 ## Requirements
 
 Inky-rb currently requires:
 
 * Ruby 2.0+
-* Rails 3, 4 or 5
+* Rails 3, 4, 5 or 6