Fix default table name being incorrect in migration generator (#274)

Author: linyclar

lib/generators/sorcery/helpers.rb

@@ -13,7 +13,7 @@ def model_class_name
       end
 
       def tableized_model_class
-        options[:model] ? options[:model].gsub(/::/, '').tableize : 'User'
+        options[:model] ? options[:model].gsub(/::/, '').tableize : 'users'
       end
 
       def model_path