Using latest version of discovery

Author: Nyholm

composer.json

@@ -16,7 +16,7 @@
         "react/http-client": "^0.4.8",
         "react/dns": "^0.4.1",
         "react/stream": "^0.4.3",
-        "php-http/discovery": "^0.8"
+        "php-http/discovery": "^0.9"
     },
     "require-dev": {
         "php-http/adapter-integration-tests": "^0.4"