Merge pull request #669 from cmmarslender/5.0

Only set Authorization header, rather than replacing all headers...

src/Guards/TokenGuard.php

@@ -137,7 +137,7 @@ protected function authenticateViaBearerToken($request)
 
             return $token ? $user->withAccessToken($token) : null;
         } catch (OAuthServerException $e) {
-            $request->headers->replace(['Authorization' => '']);
+            $request->headers->set( 'Authorization', '', true );
 
             Container::getInstance()->make(
                 ExceptionHandler::class