Update PHP to ^8.0 (#27)

.github/workflows/tests.yml

@@ -1,14 +1,17 @@
 name: Tests
-on: [push, pull_request]
+on: [push]
 
 jobs:
     phpunit:
-        name: PHP ${{ matrix.php }} (${{ matrix.composer_flags }})
+        name: PHP ${{ matrix.php }} (${{ matrix.dependency-version }})
         runs-on: ubuntu-latest
         strategy:
             matrix:
-                php: [7.1, 7.2, 7.3, 7.4]
-                composer_flags: ['--prefer-lowest', '']
+                php: [8.0, 8.1]
+                dependency-version: [lowest, highest]
+                exclude:
+                    - php: 8.1
+                      dependency-version: lowest
         steps:
             - uses: actions/checkout@v2.4.0
 
@@ -19,8 +22,11 @@ jobs:
                   extensions: mbstring
                   coverage: none
 
-            - name: Install Composer dependencies
-              run: composer update --no-interaction --no-ansi --no-suggest --prefer-dist ${{ matrix.composer_flags }}
+            - name: Install dependencies
+              uses: ramsey/composer-install@v1
+              with:
+                  dependency-versions: ${{ matrix.dependency-version }}
+                  composer-options: "--no-suggest --prefer-dist"
 
             - name: Execute tests
               run: vendor/bin/phpunit

composer.json

@@ -11,16 +11,16 @@
     "authors": [
         {
             "name": "Sven Luijten",
-            "email": "svenluijten1995@gmail.com",
+            "email": "contact@svenluijten.com",
             "homepage": "https://svenluijten.com"
         }
     ],
     "require": {
-        "php": ">=7.1.3",
-        "illuminate/support": "^5.7 || ^6.0"
+        "php": "^8.0",
+        "illuminate/support": "^8.0"
     },
     "require-dev": {
-        "graham-campbell/testbench": "^5.1"
+        "graham-campbell/testbench": "^5.5.1"
     },
     "autoload": {
         "psr-4": {