Added new PHP client library

Author: rennokki

content/en/docs/reference/using-api/client-libraries.md

@@ -59,6 +59,7 @@ their authors, not the Kubernetes team.
 | PHP                  | [github.com/allansun/kubernetes-php-client](https://github.com/allansun/kubernetes-php-client) |
 | PHP                  | [github.com/maclof/kubernetes-client](https://github.com/maclof/kubernetes-client) |
 | PHP                  | [github.com/travisghansen/kubernetes-client-php](https://github.com/travisghansen/kubernetes-client-php) |
+| PHP                  | [github.com/renoki-co/php-k8s](https://github.com/renoki-co/php-k8s) |
 | Python               | [github.com/eldarion-gondor/pykube](https://github.com/eldarion-gondor/pykube) |
 | Python               | [github.com/fiaas/k8s](https://github.com/fiaas/k8s) |
 | Python               | [github.com/mnubo/kubernetes-py](https://github.com/mnubo/kubernetes-py) |