Adds :inline option to Action Mailbox generator rails_command

Author: abhaynikam

actionmailbox/lib/generators/action_mailbox/install/install_generator.rb

@@ -21,7 +21,7 @@ def add_action_mailbox_production_environment_config
       end
 
       def create_migrations
-        rails_command "railties:install:migrations FROM=active_storage,action_mailbox"
+        rails_command "railties:install:migrations FROM=active_storage,action_mailbox", inline: true
       end
     end
   end