Update README.markdown

Duncan Grazier · Duncan Grazier · commit 04330c5414d2 · 2012-01-10T17:18:00.000-05:00
diff --git a/README.markdown b/README.markdown
@@ -6,6 +6,8 @@
 
 ## Configuration
 
+    require 'betamax'
+
     RSpec.configure do |config|
       config.include Betamax::TestHelpers
     end
