Merge pull request #9 from EmicoEcommerce/feature/php-compatibility

Drop support for end of life php versions and add support for new php versions.

Author: gdvisser

composer.json

@@ -3,7 +3,7 @@
   "license": "OSL-3.0",
   "description": "Robin HQ library",
   "require": {
-    "php": "~7.0",
+    "php": ">=7.4 <=8.1",
     "guzzlehttp/guzzle": "^7.4",
     "psr/log": "~1.0",
     "psr/container": "~1.0",