Removed ResponsePrototypeTrait

- per @weierophinney

zendframework/zend-expressive-authentication-oauth2#16 (comment)

"Each class should compose a response factory instead of a prototype. "

Author: michalbundyra

phpunit.xml.dist

@@ -5,12 +5,8 @@
          colors="true"
          stderr="true">
     <testsuites>
-        <testsuite name="without diactoros">
-            <file>./test/ResponsePrototypeTraitWithoutDiactorosTest.php</file>
-        </testsuite>
         <testsuite name="zend-expressive-authentication">
             <directory>./test</directory>
-            <exclude>./test/ResponsePrototypeTraitWithoutDiactorosTest.php</exclude>
         </testsuite>
     </testsuites>