update license

composer.json

@@ -1,6 +1,6 @@
 {
   "name": "jazzman/wp-object-cache",
-  "license": "GPL-3.0+",
+  "license": "MIT",
   "type": "wordpress-plugin",
   "description": "Enable object caching for WordPress",
   "authors": [
@@ -21,13 +21,10 @@
     "ext-ctype": "*",
     "ext-redis": "*",
     "composer/installers": "^1",
-    "jazzman/singleton-trait": "^1.1",
     "roots/wordpress": "^5"
   },
   "require-dev": {
-    "dg/composer-cleaner": "^2.1",
     "roave/security-advisories": "dev-master",
-    "symfony/var-dumper": "^4.2",
     "szepeviktor/phpstan-wordpress": "^0.7.5"
   },
   "extra": {
@@ -42,10 +39,5 @@
     "psr-4": {
       "JazzMan\\WPObjectCache\\": "src"
     }
-  },
-  "replace": {
-    "symfony/polyfill-mbstring": "*",
-    "symfony/polyfill-php80": "*",
-    "symfony/polyfill-php72": "*"
   }
 }