Switched to Symfony 5 only

composer.json

@@ -14,12 +14,12 @@
   "require": {
     "php": "^7.1.3",
     "monolog/monolog": "~1.11||^2.0",
-    "symfony/console": "^4.0||^5.0",
+    "symfony/console": "^5.0",
-    "symfony/filesystem": "^4.0||^5.0",
+    "symfony/filesystem": "^5.0",
-    "symfony/event-dispatcher": "^4.0||^5.0",
+    "symfony/event-dispatcher": "^5.0",
-    "symfony/finder": "^4.0||^5.0",
+    "symfony/finder": "^5.0",
-    "symfony/yaml": "^4.0||^5.0",
+    "symfony/yaml": "^5.0",
-    "symfony/process": "^4.0||^5.0"
+    "symfony/process": "^5.0"
   },
   "require-dev": {
     "phpunit/phpunit": "^7.0",