feat: added PHP 7.3 support to composer.json

Author: LaravelFreelancerNL

composer.json

@@ -16,7 +16,7 @@
     "minimum-stability": "dev",
     "prefer-stable" : true,
     "require": {
-        "php": "^7.4|^8.0",
+        "php": "^7.3|^7.4|^8.0",
         "ext-json": "*",
         "guzzlehttp/guzzle": "^7.2"
     },