Add constants.CR
Add constants.CR

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