Update composer.json

Author: zoransa

composer.json

@@ -18,10 +18,10 @@
         "ext-zlib": "*",
         "ext-curl": "*",
         "paquettg/string-encode": "~1.0.0",
-        "php-http/httplug": "^2.1",
-        "guzzlehttp/guzzle": "^7.0",
-        "guzzlehttp/psr7": "^1.6",
-        "myclabs/php-enum": "^1.7"
+        "php-http/httplug": "^2",
+        "guzzlehttp/guzzle": "^7",
+        "guzzlehttp/psr7": "^2",
+        "myclabs/php-enum": "^1"
     },
     "require-dev": {
         "phpunit/phpunit": "^7.5.1",