Support for multiple TXT records per subdomain (#29)

* Support for multiple TXT records per subdomain and database upgrade functionality

* Linter fixes

* Make sure the database upgrade routine works for PostgreSQL

* Move subdomain query outside of the upgrade transaction

main.go

@@ -36,6 +36,8 @@ func main() {
 	if err != nil {
 		log.Errorf("Could not open database [%v]", err)
 		os.Exit(1)
+	} else {
+		log.Info("Connected to database")
 	}
 	DB = newDB
 	defer DB.Close()