fixup! Add support Rails 6.0

lib/actual_db_schema/commands/list.rb

@@ -19,17 +19,20 @@ def preambule
         puts "\nPhantom migrations\n\n"
         puts "Below is a list of irrelevant migrations executed in unmerged branches."
         puts "To bring your database schema up to date, the migrations marked as \"up\" should be rolled back."
-        db_config = if ActiveRecord::Base.respond_to?(:connection_db_config)
-                      ActiveRecord::Base.connection_db_config.configuration_hash
-                    else
-                      ActiveRecord::Base.connection_config
-                    end
         database_path = db_config[:database]
         puts "\ndatabase: #{database_path}\n\n"
         puts header.join("  ")
         puts "-" * separator_width
       end
 
+      def db_config
+        if ActiveRecord::Base.respond_to?(:connection_db_config)
+          ActiveRecord::Base.connection_db_config.configuration_hash
+        else
+          ActiveRecord::Base.connection_config
+        end
+      end
+
       def separator_width
         header.map(&:length).sum + (header.size - 1) * 2
       end