Add PHP 7.4 and 8.0

plugins/templates/before-script.yml

@@ -4,7 +4,9 @@ before_script:
 
   # PHPUnit
   - |
-    if [[ $(php -v) =~ "PHP 7." ]]; then
+    if [[ $(php -v) =~ "PHP 8." ]]; then
+      composer global require "phpunit/phpunit=7.*"
+    elif [[ $(php -v) =~ "PHP 7." ]]; then
       composer global require "phpunit/phpunit=6.1.*"
     elif [[ $(php -v) =~ "PHP 5.6" ]]; then
       composer global require "phpunit/phpunit=5.4.*"