fix build on go1.6
fix build on go1.6

`database/sql.(*Row).Scan()`'s error message has changed slightly.

bugreplaydev/pq,johto/pq,VividCortex/pq,jnewmano/pq,ympons/pq,lib/pq,bugreplaydev/pq,ympons/pq,jnewmano/pq