Remove update and delete from CRUD example
Remove update and delete from CRUD example

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