Change actions

Author: David Bohn

.github/workflows/main.yml

@@ -13,8 +13,8 @@ jobs:
     strategy:
       matrix:
         php: [7.4, 7.3]
-        laravel: [6.*]
-        dependency-version: [prefer-lowest, prefer-stable]
+        laravel: [6.*,7.*,8.*]
+        dependency-version: [prefer-stable]
         os: [ubuntu-latest]
         include:
           - laravel: 6.*