Make method compatible with phpunit 5 and 6

Author: acrobat

test/Github/Tests/Api/Repository/ContentsTest.php

@@ -67,13 +67,13 @@ public function getFailureStubsForExistsTest()
     }
 
     /**
+     * @param \PHPUnit_Framework_MockObject_Stub|\PHPUnit\Framework\MockObject\Stub\Exception
+     *
      * @test
      * @dataProvider getFailureStubsForExistsTest
      */
-    public function shouldReturnFalseWhenFileIsNotFound(\PHPUnit_Framework_MockObject_Stub $failureStub)
+    public function shouldReturnFalseWhenFileIsNotFound($failureStub)
     {
-        $expectedValue = array('some-header' => 'value');
-
         $api = $this->getApiMock();
         $api->expects($this->once())
             ->method('head')