Fix the min version for client-common

The 1.0 release does not depend on the php-http/message and so does not bring the message factories, making testing painful

Author: stof

composer.json

@@ -13,7 +13,7 @@
     "require": {
         "php": "^5.5 || ^7.0",
         "php-http/httplug": "^1.0",
-        "php-http/client-common": "^1.0",
+        "php-http/client-common": "^1.1",
         "php-http/discovery": "^1.0",
         "php-http/message-factory": "^1.0"
     },