Allow Laravel ^8.0

Author: tomas-novotny

composer.json

@@ -22,12 +22,12 @@
   "require": {
     "ext-memcached": "*",
     "php": ">=7.1",
-    "illuminate/cache": "^5.3|^6.0|^7.0",
-    "illuminate/session": "^5.3|^6.0|^7.0",
-    "illuminate/support": "^5.3|^6.0|^7.0"
+    "illuminate/cache": "^5.3|^6.0|^7.0|^8.0",
+    "illuminate/session": "^5.3|^6.0|^7.0|^8.0",
+    "illuminate/support": "^5.3|^6.0|^7.0|^8.0"
   },
   "require-dev": {
-    "phpunit/phpunit": "^7.0|^8.0",
+    "phpunit/phpunit": "^7.0|^8.0|^9.0",
     "squizlabs/php_codesniffer": "^3.3",
     "mockery/mockery": "^1.2",
     "phpstan/phpstan": "^0.12",