Only PHP 8.1 and newer are supported (older versions have reached end…

… of life (#107)

* Only PHP 8.1 and newer are supported (older versions have reached end of life)

* Don't build on PHP 7

.github/workflows/build.yml

@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        php-versions: ['7.4', '8.1', '8.2']
+        php-versions: ['8.1', '8.3']
 
     steps:
     - uses: actions/checkout@v2

README.md

@@ -13,7 +13,7 @@ The recommended way to install seatsio-php is through [Composer](http://getcompo
 composer require seatsio/seatsio-php
 ```
 
-The minimum required PHP version is 7.4.
+The minimum required PHP version is 8.1.
 
 ## Versioning
 

composer.json

@@ -4,7 +4,7 @@
   "type": "library",
   "license": "MIT",
   "require": {
-    "php": ">=7.4.0",
+    "php": ">=8.1.0",
     "guzzlehttp/guzzle": "7.8.1",
     "guzzlehttp/uri-template": "v1.0.3",
     "netresearch/jsonmapper": "4.2.0",