update dominkl version (#4)

* Update library versions

Author: alexandrupetcu

composer.json

@@ -13,7 +13,7 @@
         "guzzlehttp/guzzle": "^6.0",
         "liuggio/statsd-php-client": "^1.0",
         "phpunit/phpunit": "^6.5|^7.0|^8.0",
-        "domnikl/statsd": "^3.0"
+        "domnikl/statsd": "^2.0|^3.0"
     },
     "autoload": {
         "psr-4": {