Update ci.yml

Author: rennokki

.github/workflows/ci.yml

@@ -19,19 +19,15 @@ jobs:
     strategy:
       matrix:
         php:
-          - '7.2'
           - '7.3'
           - '7.4'
         laravel:
-          - 6.*
           - 7.*
           - 8.*
         prefer:
           - 'prefer-lowest'
           - 'prefer-stable'
         include:
-          - laravel: '6.*'
-            testbench: '4.*'
           - laravel: '7.*'
             testbench: '5.*'
           - laravel: '8.*'