README.md in rbs-3.1.3 vs README.md in rbs-3.2.0.pre.1

@@ -5,10 +5,10 @@
 It also allows declaring constants and global variables.
 
 The following is a small example of RBS for a chat app.
 
 <!-- run-start:a.rbs:bundle exec rbs -I a.rbs validate -->
-```rb
+```rbs
 module ChatApp
   VERSION: String
 
   class User
     attr_reader login: String