Add PHP 8.0 support (#27)

* Add PHP 8.0 support

* Drop support for Laravel 5.8

* Attempt to fix test suite

Author: jrmajor

.github/workflows/run-tests.yml

@@ -9,8 +9,8 @@ jobs:
             fail-fast: false
             matrix:
                 os: [ubuntu-latest, windows-latest]
-                php: [7.4]
-                laravel: [5.8.*, 6.*, 7.*, 8.*]
+                php: [8.0, 7.4]
+                laravel: [6.*, 7.*, 8.*]
                 dependency-version: [prefer-lowest, prefer-stable]
                 include:
                     -   laravel: 8.*
@@ -19,8 +19,6 @@ jobs:
                         testbench: 5.*
                     -   laravel: 6.*
                         testbench: 4.*
-                    -   laravel: 5.8.*
-                        testbench: 3.8.*
 
         name: P${{ matrix.php }} - L${{ matrix.laravel }} - ${{ matrix.dependency-version }} - ${{ matrix.os }}
 
@@ -38,7 +36,7 @@ jobs:
                 uses: shivammathur/setup-php@v2
                 with:
                     php-version: ${{ matrix.php }}
-                    extensions: dom, curl, libxml, mbstring, zip, pcntl, pdo, sqlite, pdo_sqlite, bcmath, soap, intl, gd, exif, iconv, imagick
+                    extensions: dom, curl, libxml, mbstring, zip, pcntl, pdo, sqlite, pdo_sqlite, bcmath, soap, intl, gd, exif, iconv, imagick, fileinfo
                     coverage: none
 
             -   name: Install dependencies

composer.json

@@ -16,12 +16,12 @@
         }
     ],
     "require": {
-        "php": "^7.4",
-        "illuminate/session": "^5.8|^6.0|^7.0|^8.0"
+        "php": "^7.4 || ^8.0",
+        "illuminate/session": "^6.0|^7.0|^8.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^8.0|^9.0",
-        "orchestra/testbench": "^3.8|^4.0|^5.0|^6.0"
+        "orchestra/testbench": "^4.0|^5.0|^6.0"
     },
     "autoload": {
         "psr-4": {