Add support for universal wheel distribution.
Add support for universal wheel distribution.

MartinThoma/PyMySQL,wraziens/PyMySQL,yeyinzhu3211/PyMySQL,DashaChuk/PyMySQL,yeyinzhu3211/PyMySQL,jwjohns/PyMySQL,lzedl/PyMySQL,xjzhou/PyMySQL,NunoEdgarGub1/PyMySQL,boneyao/PyMySQL,anson-tang/PyMySQL,methane/PyMySQL,nju520/PyMySQL,wraziens/PyMySQL,aio-libs/aiomysql,jheld/PyMySQL,eibanez/PyMySQL,Ting-y/PyMySQL,pulsar314/Tornado-MySQL,xjzhou/PyMySQL,mosquito/Tornado-MySQL,lzedl/PyMySQL,pymysql/pymysql,modulexcite/PyMySQL,PyMySQL/PyMySQL,PyMySQL/Tornado-MySQL,eibanez/PyMySQL,Geoion/Tornado-MySQL