Remove excess parameter from createHandler

It only takes 3 parameters

tests/Monolog/Handler/PushoverHandlerTest.php

@@ -48,7 +48,7 @@ class PushoverHandlerTest extends TestCase
 
     public function testWriteWithComplexTitle()
     {
-        $this->createHandler('myToken', 'myUser', 'Backup finished - SQL1', Logger::EMERGENCY);
+        $this->createHandler('myToken', 'myUser', 'Backup finished - SQL1');
         $this->handler->handle($this->getRecord(Logger::CRITICAL, 'test1'));
         fseek($this->res, 0);
         $content = fread($this->res, 1024);