Removed middleware related code to middleware-json

Author: WyriHaximus

composer.json

@@ -9,11 +9,7 @@
   ],
   "require": {
     "php": "^7.0",
-    "api-clients/middleware": "^2.0",
-    "clue/buzz-react": "^1.1",
     "daverandom/exceptional-json": "^1.0.1",
-    "psr/http-message": "^1.0",
-    "ringcentral/psr7": "^1.2",
     "wyrihaximus/ticking-promise": "^1.6"
   },
   "require-dev": {