Update tests

Author: Nyholm

composer.json

@@ -22,7 +22,7 @@
     "require-dev": {
         "phpunit/phpunit": "^6.0",
         "amphp/phpunit-util": "^1",
-        "php-http/client-integration-tests": "^0.6.1",
+        "php-http/client-integration-tests": "^0.6.2",
         "php-http/message": "^1.6"
     },
     "provide": {