Update composer config

Author: ADmad

composer.json

@@ -11,11 +11,11 @@
     ],
     "require": {
         "php": "^7.2",
-        "composer-plugin-api": "^1.0||^2.0"
+        "composer-plugin-api": "^1.0 || ^2.0"
     },
     "require-dev": {
         "cakephp/cakephp-codesniffer": "^4.1",
-        "composer/composer": "^2.0",
+        "composer/composer": "^2.0@RC",
         "phpunit/phpunit": "~8.5.0"
     },
     "autoload": {
@@ -34,6 +34,5 @@
     "config": {
         "sort-packages": true
     },
-    "minimum-stability": "dev",
     "prefer-stable": true
 }