updated readme with Yandex support.

README.md

@@ -39,6 +39,7 @@ The current supported providers are:
 - PointHQ ([docs](https://pointhq.com/api/docs))
 - Rage4 ([docs](https://gbshouse.uservoice.com/knowledgebase/articles/109834-rage4-dns-developers-api))
 - Transip ([docs](https://www.transip.nl/transip/api/))
+- Yandex ([docs](https://tech.yandex.com/domain/doc/reference/dns-add-docpage/))
 - Vultr ([docs](https://www.vultr.com/api/))
 
 Potential providers are as follows. If you would like to contribute one, please open a pull request.
@@ -66,7 +67,6 @@ Potential providers are as follows. If you would like to contribute one, please
 - SoftLayer ([docs](https://sldn.softlayer.com/article/REST#HTTP_Request_Types))
 - ~~UltraDNS ([docs](https://restapi.ultradns.com/v1/docs))~~ <sub>Unable to test, requires paid account</sub>
 - ~~WorldWideDns ([docs](https://www.worldwidedns.net/dns_api_protocol.asp))~~ <sub>Unable to test, requires paid account</sub>
-- Yandex ([docs](https://tech.yandex.com/domain/doc/reference/dns-add-docpage/))
 - ~~Zerigo ([docs](https://www.zerigo.com/managed-dns/rest-api))~~ <sub>Unable to test, requires paid account</sub>
 - ~~Zonomi ([docs](http://zonomi.com/app/dns/dyndns.jsp))~~ <sub>Unable to test, requires paid account</sub>