Merge pull request #27349 from y-yagi/fix_ruby_warning_in_ruby_2_4

fix new warning in ruby 2.4

activerecord/test/cases/adapters/mysql2/reserved_word_test.rb

@@ -143,7 +143,7 @@ def drop_tables_directly(table_names, connection = @connection)
     end
 
     # custom create table, uses execute on connection to create a table, note: escapes table_name, does NOT escape columns
-    def create_tables_directly (tables, connection = @connection)
+    def create_tables_directly(tables, connection = @connection)
       tables.each do |table_name, column_properties|
         connection.execute("CREATE TABLE `#{table_name}` ( #{column_properties} )")
       end

activesupport/test/caching_test.rb

@@ -983,7 +983,7 @@ def test_prune_size_on_write_based_on_key_length
   end
 
   def test_pruning_is_capped_at_a_max_time
-    def @cache.delete_entry (*args)
+    def @cache.delete_entry(*args)
       sleep(0.01)
       super
     end