Bump dependecies for Laravel 8 (#364)

Author: jasonmccreary

composer.json

@@ -10,15 +10,15 @@
     "require": {
         "laravel-shift/faker-registry": "^0.1",
         "symfony/yaml": "^4.3|^5.0",
-        "illuminate/console": "^6.0|^7.0",
-        "illuminate/filesystem": "^6.0|^7.0",
-        "illuminate/support": "^6.0|^7.0",
+        "illuminate/console": "^6.0|^7.0|^8.0",
+        "illuminate/filesystem": "^6.0|^7.0|^8.0",
+        "illuminate/support": "^6.0|^7.0|^8.0",
         "doctrine/dbal": "^2.9"
     },
     "require-dev": {
-        "phpunit/phpunit": "^8.0",
+        "phpunit/phpunit": "^8.0|^9.3",
         "mockery/mockery": "^1.3",
-        "orchestra/testbench": "^4.0|^5.0"
+        "orchestra/testbench": "^4.0|^5.0|^6.0"
     },
     "autoload": {
         "psr-4": {