fix db util remove mysql driver

db/db.go

@@ -10,7 +10,7 @@ import (
 	// PostgreSQL
 	_ "github.com/lib/pq"
 	// MySQL
-	_ "github.com/go-sql-driver/mysql"
+	//_ "github.com/go-sql-driver/mysql"
 	"github.com/jmoiron/sqlx"
 )