Support pgx versioned names

This commit supports the driver names pgx/v4 and pgx/v5. These aliases
of different versions of pgx allow loading the proper driver if
a dependency of a project imports a different one.

Signed-off-by: Mariano Cano <[email protected]>

Author: maraino

bind.go

@@ -22,7 +22,7 @@ const (
 )
 
 var defaultBinds = map[int][]string{
-	DOLLAR:   []string{"postgres", "pgx", "pq-timeouts", "cloudsqlpostgres", "ql", "nrpostgres", "cockroach"},
+	DOLLAR:   []string{"postgres", "pgx", "pgx/v4", "pgx/v5", "pq-timeouts", "cloudsqlpostgres", "ql", "nrpostgres", "cockroach"},
 	QUESTION: []string{"mysql", "sqlite3", "nrmysql", "nrsqlite3"},
 	NAMED:    []string{"oci8", "ora", "goracle", "godror"},
 	AT:       []string{"sqlserver"},

bind_test.go

@@ -7,7 +7,7 @@ import (
 
 func oldBindType(driverName string) int {
 	switch driverName {
-	case "postgres", "pgx", "pq-timeouts", "cloudsqlpostgres", "ql":
+	case "postgres", "pgx", "pgx/v4", "pgx/v5", "pq-timeouts", "cloudsqlpostgres", "ql":
 		return DOLLAR
 	case "mysql":
 		return QUESTION