Fix README
Fix README

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