Print postgres version on start in a single-session mode

pkg/cli/cli.go

@@ -79,6 +79,10 @@ func initClient() {
 		exitWithMessage(err.Error())
 	}
 
+	if !command.Opts.Sessions {
+		fmt.Printf("Server runs PostgreSQL v%s\n", cl.ServerVersion())
+	}
+
 	fmt.Println("Checking database objects...")
 	_, err = cl.Objects()
 	if err != nil {

pkg/client/client.go

@@ -260,6 +260,10 @@ func (client *Client) SetReadOnlyMode() error {
 	return nil
 }
 
+func (client *Client) ServerVersion() string {
+	return client.serverVersion
+}
+
 func (client *Client) query(query string, args ...interface{}) (*Result, error) {
 	// We're going to force-set transaction mode on every query.
 	// This is needed so that default mode could not be changed by user.