Update maintainer and add classifiers to setup.py (close #174).
Update maintainer and add classifiers to setup.py (close #174).

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