Require HTTPlug 2.0

Author: ruudk

composer.json

@@ -29,7 +29,7 @@
         "php-http/client-common": "^1.9 || ^2.0",
         "php-http/client-implementation": "^1.0",
         "php-http/discovery": "^1.14",
-        "php-http/httplug": "^1.0 || ^2.0",
+        "php-http/httplug": "^2.0",
         "php-http/logger-plugin": "^1.1",
         "php-http/message": "^1.4",
         "php-http/message-factory": "^1.0.2",