Documentation: Adding new Ruby v3 client entry to integrations.md
- [iconara/etcd-rb](https://github.com/iconara/etcd-rb)
- [jpfuentes2/etcd-ruby](https://github.com/jpfuentes2/etcd-ruby)
- [ranjib/etcd-ruby](https://github.com/ranjib/etcd-ruby) - Supports v2
+- [davissp14/etcdv3-ruby](https://github.com/davissp14/etcdv3-ruby) - Supports v3
**C libraries**
