Update code to PHP 8

Author: Sasa Blagojevic

composer.json

@@ -6,7 +6,7 @@
         "php",
         "command-bus"
     ],
-    "version": "0.1.0",
+    "version": "1.0.0",
     "license": "MIT",
     "authors": [
         {
@@ -27,12 +27,12 @@
         "files": ["tests/functions.php"]
     },
     "require": {
-        "php": ">=7.0",
+        "php": ">=8.0",
         "psr/container": "^1.0",
         "psr/log": "^1.1"
     },
     "require-dev": {
-        "phpunit/phpunit": "^6.5",
-        "ramsey/uuid": "^3.9"
+        "phpunit/phpunit": "^9.5",
+        "ramsey/uuid": "^4.1"
     }
 }