Merge pull request #23 from php-http/Nyholm-patch-1

We do also provide async client

Author: Nyholm

composer.json

@@ -41,7 +41,8 @@
         }
     },
     "provide": {
-        "php-http/client-implementation": "1.0"
+        "php-http/client-implementation": "1.0",
+        "php-http/async-client-implementation": "1.0"
     },
     "scripts": {
         "test": "vendor/bin/phpunit",