Remove read() it isn't needed.

Author: markstory

src/Authenticator/SessionAuthenticator.php

@@ -86,7 +86,6 @@ public function persistIdentity(ServerRequestInterface $request, ResponseInterfa
         $sessionKey = $this->getConfig('sessionKey');
         $session = $request->getAttribute('session');
         if (!$session->check($sessionKey)) {
-            $session->read();
             $session->renew();
             $session->write($sessionKey, $identity);
         }

tests/TestCase/Authenticator/SessionAuthenticatorTest.php

@@ -168,17 +168,13 @@ public function testPersistIdentity()
             ->expects($this->once())
             ->method('renew');
 
-        $this->sessionMock
-            ->expects($this->once())
-            ->method('read');
-
         $this->sessionMock
             ->expects($this->once())
             ->method('write')
             ->with('Auth', $data);
 
         $this->sessionMock
-            ->expects($this->at(4))
+            ->expects($this->at(3))
             ->method('check')
             ->with('Auth')
             ->will($this->returnValue(true));