move phpunit to require dev

Author: MrEssex

composer.json

@@ -1,29 +1,29 @@
 {
   "name": "mressex/cache",
+  "description": "Different PSR-16 cache implementations",
+  "license": "MIT",
   "type": "library",
-  "description": "Different PSR-16 cache implementations ",
   "keywords": [
     "Cache",
     "Caching"
   ],
-  "license": "MIT",
   "authors": [
     {
       "name": "Kyle Essex"
     }
   ],
   "require": {
-    "php": ">=7.4",
+    "php": "^7.4 || ^8.0",
     "ext-apcu": "*",
-    "phpunit/phpunit": "^9.5.2",
     "psr/simple-cache": "^1.0"
   },
-  "provide": {
-    "psr/simple-cache-implementation": "^1.0"
-  },
   "require-dev": {
+    "phpunit/phpunit": "^9.5.2",
     "roave/security-advisories": "dev-master"
   },
+  "provide": {
+    "psr/simple-cache-implementation": "^1.0"
+  },
   "autoload": {
     "psr-4": {
       "MrEssex\\FileCache\\": "src",