Downgrade options resolver

Author: LogansUA

composer.json

@@ -14,7 +14,7 @@
     "require": {
         "php": ">=5.6.0",
         "guzzlehttp/guzzle": "^6.1@dev",
-        "symfony/options-resolver": "^3.0"
+        "symfony/options-resolver": "^2.8"
     },
     "autoload": {
         "psr-4": {