Update composer dependencies

Author: codenix-sv

composer.json

@@ -18,12 +18,11 @@
     ],
     "require": {
         "php": "^7.2",
-        "ext-json": "*"
-
+        "ext-json": "*",
+        "guzzlehttp/guzzle": "~6.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^8.0",
-        "guzzlehttp/guzzle": "~6.0"
+        "phpunit/phpunit": "^8.0"
     },
     "autoload": {
         "psr-4": { "Codenixsv\\CoinGeckoApi\\": "src/" }