Incompatibility issue 4.6: using CRM_Utils_System::getUrlPath

CiviRules at Amnesty (civi 4.6) gets this error with release 2.0: [20-Jun-2018 10:50:39 Europe/Brussels] PHP Fatal error: Call to undefined method CRM_Utils_System::getUrlPath() in /home/xxcivi1/public_html/sites/default/files/civicrm/ext/org.civicoop.civirules/CRM/Civirules/Form/Search/Rules.php on line 22

Probably needs to check the version and use the CRM_Utils_System::url if less than 5.0? Or use a more backwards compatible method (see related https://github.com/veda-consulting/uk.co.vedaconsulting.gdpr/issues/62)