install.rb in ahoy_email-0.5.0

- old
+ new

@@ -1,5 +1,5 @@
-class <%= migration_class_name %> < ActiveRecord::Migration
+class <%= migration_class_name %> < ActiveRecord::Migration<%= migration_version %>
   def change
     create_table :ahoy_messages do |t|
       t.string :token
 
       # user