#12 - use github actions to pass CI and release plugin version

#12 - fix test API

 #12 - update minimum required Moodle version

 #12 - update CHANGES.md

tests/ip_test.php

@@ -22,7 +22,7 @@ require_once($CFG->dirroot.'/auth/ip/auth.php');
 class auth_ip_testcase extends advanced_testcase {
     protected $authplugin;
 
-    protected function setUp() {
+    protected function setUp() : void {
         $this->authplugin = new auth_plugin_ip();
     }