Add -e php option to parallel-lint

.travis.yml

@@ -270,7 +270,7 @@ script:
   #parallel-lint --exclude htdocs/includes --blame .
   # Exclusions are defined in the ruleset.xml file
   if [ "$TRAVIS_PHP_VERSION" = "7.4" ]; then
-    parallel-lint --exclude dev/tools/test/namespacemig --exclude htdocs/includes/composer --exclude htdocs/includes/myclabs --exclude htdocs/includes/phpspec --exclude dev/initdata/dbf/includes \
+    parallel-lint -e php --exclude dev/tools/test/namespacemig --exclude htdocs/includes/composer --exclude htdocs/includes/myclabs --exclude htdocs/includes/phpspec --exclude dev/initdata/dbf/includes \
       --exclude htdocs/includes/sabre --exclude htdocs/includes/phpoffice/PhpSpreadsheet --exclude htdocs/includes/sebastian \
       --exclude htdocs/includes/squizlabs/php_codesniffer --exclude htdocs/includes/jakub-onderka --exclude htdocs/includes/php-parallel-lint --exclude htdocs/includes/symfony \
       --exclude htdocs/includes/mike42/escpos-php/example --exclude htdocs/includes/maximebf \