Update Github Actions configuration

Author: markwalet

.github/workflows/coverage.yml

@@ -16,7 +16,7 @@ jobs:
         uses: actions/cache@v1
         with:
           path: ~/.composer/cache/files
-          key: dependencies-php-7.4-illuminate-7.*-composer-${{ hashFiles('composer.json') }}
+          key: dependencies-php-7.4-illuminate-8.*-composer-${{ hashFiles('composer.json') }}
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2

.github/workflows/tests.yml

@@ -14,16 +14,20 @@ jobs:
       fail-fast: true
       matrix:
         php: [7.2, 7.3, 7.4]
-        illuminate: [6.*, 7.*]
+        illuminate: [6.*, 7.*, 8.*]
         stability: [prefer-lowest, prefer-stable]
         include:
           - illuminate: 6.*
             testbench: 4.*
           - illuminate: 7.*
             testbench: 5.*
+          - illuminate: 8.*
+            testbench: 6.*
         exclude:
           - php: 7.4
             illuminate: 6.*
+          - php: 7.2
+            illuminate: 8.*
 
     name: P${{ matrix.php }} - I${{ matrix.illuminate }} - ${{ matrix.stability }}