[FEATURE] Updated to support Laravel 7

All tests pass, changes were minimal. Composer dependancies updated to
match Laravel 7.

NB: Should not be merged until laravel-doctrine/orm#438 is.

Author: barryo

.travis.yml

@@ -3,6 +3,7 @@ language: php
 php:
   - 7.2
   - 7.3
+  - 7.4
 
 before_script:
   - travis_retry composer self-update

composer.json

@@ -1,6 +1,6 @@
 {
   "name": "laravel-doctrine/acl",
-  "description": "Doctrine ACL for Doctrine 2 and Laravel 6",
+  "description": "Doctrine ACL for Doctrine 2 and Laravel 7",
   "license": "MIT",
   "keywords": [
     "doctrine",
@@ -22,16 +22,16 @@
     }
   ],
   "require": {
-    "php": "^7.2",
-    "illuminate/auth": "^6.0",
-    "illuminate/config": "^6.0",
-    "illuminate/contracts": "^6.0",
-    "illuminate/support": "^6.0",
-    "laravel-doctrine/orm": "~1.5.0"
+    "php": "^7.2.5",
+    "illuminate/auth": "^7.0",
+    "illuminate/config": "^7.0",
+    "illuminate/contracts": "^7.0",
+    "illuminate/support": "^7.0",
+    "laravel-doctrine/orm": "~1.6.0"
   },
   "require-dev": {
-    "phpunit/phpunit": "^7.0",
-    "mockery/mockery": "^1.0"
+    "mockery/mockery": "^1.3.1",
+    "phpunit/phpunit": "^8.5"
   },
   "autoload": {
     "psr-4": {