Restore symfony 2 support

Author: redthor

composer.json

@@ -15,8 +15,8 @@
     "require": {
         "php": "^5.6|^7.1",
         "doctrine/mongodb": "^1.0",
-        "symfony/console": "^3.3|^4",
-        "symfony/yaml": "^3.3|^4"
+        "symfony/console": "^2.7|^3.3|^4",
+        "symfony/yaml": "^2.7|^3.3|^4"
     },
     "require-dev": {
         "antimattr/test-case": "~1.0@stable",