some small readme adjustments for the named stmt changes
some small readme adjustments for the named stmt changes

wmydz1/sqlx,beni55/sqlx,jmoiron/sqlx,proteneer/sqlx,aiyi/sqlx,johnsto/sqlx,larsth/sqlx,StabbyCutyou/sqlx,outrightmental/go-sqlx,adcaes/sqlx,snikch/sqlx,cortex/sqlx