Update to use the latest integration tests

Nyholm · Nyholm · commit 60d4ab4cf979 · 2017-07-07T19:33:15.000+02:00
diff --git a/composer.json b/composer.json
@@ -17,7 +17,7 @@
         "cakephp/cakephp": "^3.1"
     },
     "require-dev": {
-        "php-http/client-integration-tests": "^0.5.1"
+        "php-http/client-integration-tests": "^0.6"
     },
     "autoload": {
         "psr-4": {
