options-resolver is required and was implicit by form before

Author: Tobion

composer.json

@@ -16,6 +16,7 @@
         "symfony/framework-bundle": "^2.8|^3.2",
         "symfony/console": "^2.8|^3.2",
         "symfony/dependency-injection": "^2.8|^3.2",
+        "symfony/options-resolver" : "^2.8|^3.2",
         "symfony/property-access": "^2.8|^3.2",
         "psr/log": "~1.0",
         "ruflin/elastica": "3.2.*"