Fix syntax error with invalid string constant.
Fix syntax error with invalid string constant.

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