Ensure message passed to warnings.warn is str
Ensure message passed to warnings.warn is str

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