Update mysqlclient from 1.3.9 to 1.3.10 (#2372)
Update mysqlclient from 1.3.9 to 1.3.10 (#2372)

https://github.com/PyMySQL/mysqlclient-python/blob/master/HISTORY.md#whats-new-in-1310
tojonmz/treeherder,tojonmz/treeherder,KWierso/treeherder,KWierso/treeherder,edmorley/treeherder,tojonmz/treeherder,tojon/treeherder,tojonmz/treeherder,tojonmz/treeherder,edmorley/treeherder,edmorley/treeherder,KWierso/treeherder,tojon/treeherder,KWierso/treeherder,tojon/treeherder,edmorley/treeherder,tojon/treeherder,tojonmz/treeherder