Update phpunit.yml

Author: barryvdh

.github/workflows/phpunit.yml

@@ -18,6 +18,7 @@ jobs:
           - "lowest"
           - "highest"
         php-version:
+          - "7.2"
           - "7.3"
           - "7.4"
           - "8.0"
@@ -45,4 +46,4 @@ jobs:
         run: "composer update --no-interaction --no-progress --no-suggest"
 
       - name: "Tests"
-        run: "vendor/bin/phpunit"
+        run: "vendor/bin/phpunit"