- Drop not really needed python-devel dependency

- use %license instead of %doc [bsc#1082318]
- update to latest version to solve MySQLdb interface problems with
salt-2018
- update to 0.8.1
* Reduce `cursor.callproc()` roundtrip time. (#636)
* Fixed `cursor.query()` is hunged after multi statement failed. (#647)
* WRONG_DB_NAME and WRONG_COLUMN_NAME is ProgrammingError for now. (#629)
* Many test suite improvements, especially adding MySQL 8.0 and using Docker.
* Droppped support for old Python and MySQL whih is not tested long time.
- update to 0.8
* **BACKWARD INCOMPATIBLE** ``binary_prefix`` option is added and off
by default because of compatibility with mysqlclient.
When you need PyMySQL 0.7 behavior, you have to pass ``binary_prefix=True``.
(#549)
* **BACKWARD INCOMPATIBLE** ``MULTI_STATEMENTS`` client flag is no longer
set by default, while it was on PyMySQL 0.7. You need to pass
``client_flag=CLIENT.MULTI_STATEMENTS`` when you connect to explicitly
enable multi-statement mode. (#590)
* Fixed AuthSwitch packet handling.
* Raise OperationalError for MariaDB's constraint error. (#607)
* executemany() accepts query without space between ``VALUES`` and ``(``. (#597)
* Support config file containing option without value. (#588)
* Fixed Connection.ping() returned unintended value.