Add file information to warnings
Add file information to warnings

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