Allow for Symfony4 components

Author: bigfoot90

.gitignore

@@ -1,4 +1,5 @@
 .php_cs.cache
 build
 config/parameters.yml
+composer.lock
 vendor

composer.json

@@ -27,8 +27,8 @@
     "require": {
         "php": "^5.6 || ^7.0",
         "ramsey/uuid": "^3.6",
-        "symfony/console": "^3.2",
-        "symfony/yaml": "^3.3",
+        "symfony/console": "^3.2|^4.0",
+        "symfony/yaml": "^3.3|^4.0",
         "doctrine/annotations": "1.2.*",
         "doctrine/instantiator": "1.0.*",
         "mauretto78/array-query": "^1.0"