Remove duplicate

Author: Prometee

composer.json

@@ -43,12 +43,11 @@
     },
     "conflict": {
         "php-http/guzzle6-adapter": "<1.1",
-        "php-http/cache-plugin": "<1.7.0",
+        "php-http/cache-plugin": "<1.7",
         "php-http/curl-client": "<2.0",
         "php-http/socket-client": "<2.0",
         "kriswallsmith/buzz": "<0.17",
-        "php-http/react-adapter": "<3.0",
-        "php-http/cache-plugin": "<1.7"
+        "php-http/react-adapter": "<3.0"
     },
     "require-dev": {
         "guzzlehttp/psr7": "^1.7 || ^2.0",