Add PHP 8.1 to test suite (#1)

Author: denisp22

.github/workflows/tests.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php: [7.4, 8.0]
+        php: [7.4, 8.0, 8.1]
         laravel: [6.*, 7.*, 8.*]
         dependency-version: [prefer-lowest, prefer-stable]
         include:
@@ -22,6 +22,12 @@ jobs:
         exclude:
           - php: 8.0
             dependency-version: prefer-lowest
+          - php: 8.1
+            dependency-version: prefer-lowest
+          - php: 8.1
+            laravel: 6.*
+          - php: 8.1
+            laravel: 7.*
     steps:
       - name: Checkout Code
         uses: actions/checkout@v2