Require psr/http-client and psr/http-client-factory.

Author: donquixote

composer.json

@@ -28,7 +28,9 @@
     "ext-json": "*",
     "ext-mbstring": "*",
     "ext-simplexml": "*",
-    "marc-mabe/php-enum": "^v4.7.0"
+    "marc-mabe/php-enum": "^v4.7.0",
+    "psr/http-client": "^1.0",
+    "psr/http-factory": "^1.1"
   },
   "require-dev": {
     "bmitch/churn-php": "^1.7",