Fix none auth method

Author: mbilski

internal/oauth2/request.go

@@ -112,6 +112,8 @@ func (r *Request) AuthenticateClient(
 	var err error
 
 	switch cconfig.AuthMethod {
+	case NoneAuthMethod:
+		r.Form.Set("client_id", cconfig.ClientID)
 	case ClientSecretPostAuthMethod:
 		r.Form.Set("client_id", cconfig.ClientID)
 		r.Form.Set("client_secret", cconfig.ClientSecret)