add missing extend_schemata method
add missing extend_schemata method

yx91490/pgcli,johshoff/pgcli,dbcli/pgcli,j-bennet/pgcli,janusnic/pgcli,d33tah/pgcli,j-bennet/pgcli,dbcli/pgcli,n-someya/pgcli,dbcli/vcli,johshoff/pgcli,thedrow/pgcli,bitmonk/pgcli,joewalnes/pgcli,bitmonk/pgcli,koljonen/pgcli,yx91490/pgcli,lk1ngaa7/pgcli,darikg/pgcli,janusnic/pgcli,MattOates/pgcli,joewalnes/pgcli,dbcli/vcli,suzukaze/pgcli,n-someya/pgcli,nosun/pgcli,d33tah/pgcli,zhiyuanshi/pgcli,w4ngyi/pgcli,nosun/pgcli,suzukaze/pgcli,MattOates/pgcli,TamasNo1/pgcli,koljonen/pgcli,darikg/pgcli,w4ngyi/pgcli,bitemyapp/pgcli,lk1ngaa7/pgcli,zhiyuanshi/pgcli,thedrow/pgcli,TamasNo1/pgcli,bitemyapp/pgcli