Fix missing Mockery dependency & added PHP 8 requirements.

Author: olsgreen

composer.json

@@ -11,12 +11,13 @@
     ],
     "prefer-stable": true,
     "require": {
-        "php": "^7.1.3",
+        "php": "^7.1.3|^8.0",
         "illuminate/contracts": "^5.6|^6.0",
         "illuminate/http": "^5.6|^6.0",
         "s1lentium/iptools": "^1.1"
     },
     "require-dev": {
+        "mockery/mockery": "^1.3.3",
         "orchestra/testbench": "^3.6|^3.7|^3.8|^4.0",
         "symfony/thanks": "^1.0"
     },