PHP 7/8 compatibility (#317)

* PHP 8 compatibility

n/t

* Update composer.json

Author: SoftCreatR

composer.json

@@ -32,7 +32,7 @@
     "phpunit/phpunit": "^8.5|^9.4",
     "roave/security-advisories": "dev-latest",
     "squizlabs/php_codesniffer": "^3.5",
-    "softcreatr/jsonpath": "^0.6.4",
+    "softcreatr/jsonpath": "^0.7 || ^0.8",
     "phpspec/prophecy-phpunit": "^2.0"
   },
   "config": {