Support PHPUnit 5 and 6

Author: carusogabriel

composer.json

@@ -7,7 +7,7 @@
         "php": ">=5.4.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "~4.8.35"
+        "phpunit/phpunit": "~4.8.35 || ^5.7 || ^6.4"
     },
     "suggest": {
         "ext-libevent": ">=0.1.0 for LibEventLoop and PHP5 only",

tests/StreamSelectLoopTest.php

@@ -154,7 +154,9 @@ protected function forkSendSignal($signal)
     public function testSmallTimerInterval()
     {
         /** @var StreamSelectLoop|\PHPUnit_Framework_MockObject_MockObject $loop */
-        $loop = $this->getMock('React\EventLoop\StreamSelectLoop', ['streamSelect']);
+        $loop = $this->getMockBuilder('React\EventLoop\StreamSelectLoop')
+                    ->setMethods(['streamSelect'])
+                    ->getMock();
         $loop
             ->expects($this->at(0))
             ->method('streamSelect')