before AR 4.0 table.remove only accepted a single column name

Author: kares

test/db/mysql/simple_test.rb

@@ -272,7 +272,11 @@ def test_mysql_indexes
 
       assert_queries(1) do
         with_bulk_change_table('bulks') do |t|
-          t.remove :qualification, :experience
+          if ar_version('4.0')
+            t.remove :qualification, :experience
+          else
+            t.remove :qualification; t.remove :experience
+          end
           t.string :qualification_experience
         end
       end