Merge pull request #249 from AlchemyCMS/fix-logout-method

fix: Convert `Devise.sign_out_via` to String

Author: tvdeyen

config/initializers/alchemy.rb

@@ -18,5 +18,5 @@
   Alchemy.signup_path = "/admin/signup"
   Alchemy.login_path = "/admin/login"
   Alchemy.logout_path = "/admin/logout"
-  Alchemy.logout_method = Devise.sign_out_via
+  Alchemy.logout_method = Devise.sign_out_via.to_s
 end