Using discovery 1.0

Author: Nyholm

composer.json

@@ -19,7 +19,7 @@
     "require": {
         "php":             "^5.5|^7.0",
         "php-http/httplug": "^1.0",
-        "php-http/discovery": "^0.9",
+        "php-http/discovery": "^1.0",
         "php-http/client-implementation": "^1.0",
         "php-http/client-common": "^1.1"
     },