Merge pull request #13 from kfeng0806/symfony-process-backward-compatible

Add symfony process 4.2 support back

Author: aminyazdanpanah

composer.json

@@ -15,7 +15,7 @@
     ],
     "require": {
         "php": "^7.2",
-        "symfony/process": "^5.0"
+        "symfony/process": "^4.2|^5.0"
     },
     "require-dev": {
         "phpunit/phpunit": "9.1.4"