Update pymysql to 0.9.0

[pyup-bot]

This PR updates PyMySQL from 0.8.1 to 0.9.0.

Changelog

0.9.0

Release date: 2018-06-27

* Change default charset from latin1 to utf8mb4.  (because MySQL 8 changed) (692)
* Support sha256_password and caching_sha2_password auth method (682)
* Add cryptography dependency, because it's needed for new auth methods.
* Remove deprecated `no_delay` option (694)
* Support connection attributes (679)
* Map LOCK_DEADLOCK to OperationalError (693)

Links

• PyPI: https://pypi.org/project/pymysql
• Changelog: https://pyup.io/changelogs/pymysql/
• Repo: https://github.com/PyMySQL/PyMySQL/

[codecov-io]

Codecov Report

Merging #31 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #31   +/-   ##
=======================================
  Coverage   98.94%   98.94%           
=======================================
  Files          26       26           
  Lines        1993     1993           
=======================================
  Hits         1972     1972           
  Misses         21       21

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[pyup-bot]

Closing this in favor of #36