“Unable to create the django_migrations table (%s)

环境：python3.6 + django2.1 +mysql5.5
执行python manage.py migrate时报错如下
“Unable to create the django_migrations table (%s)” % exc
django.db.migrations.exceptions.MigrationSchemaMissing: Unable to create the django_migrations table ((1064, “You have an error in your SQL syntax; check the manual t
hat corresponds to your MySQL server version for the right syntax to use near ‘(6) NOT NULL)’ at line 1”))

原因：django2.1 版本不再支持mysql5.5