Fixed bug occurred while rebasing.

Author: Nyholm

composer.json

@@ -14,9 +14,10 @@
     "require": {
         "php": "^5.6 || ^7.0",
         "psr/http-message": "^1.0",
-        "php-http/client-implementation": "^2.0",
+        "php-http/client-implementation": "^1.0",
         "php-http/httplug": "^1.0",
-        "php-http/discovery": "^1.0"
+        "php-http/discovery": "^1.0",
+        "paragonie/random_compat": "^2.0"
     },
     "require-dev": {
         "phpunit/phpunit": "~4.0",