Allow newest 4.x version of symfony/process

Andreas Frömer · icanhazstring · commit 8949ff98589a · 2020-02-16T13:07:35.000+01:00
diff --git a/composer.json b/composer.json
@@ -4,7 +4,7 @@
     "type": "library",
     "require": {
         "php": "^7.1",
-        "symfony/process": "^3.2"
+        "symfony/process": "^3.2 || ^4.4"
     },
     "require-dev": {
         "phpunit/phpunit": "^6.1",
