Update README.md

Author: ruslandoga

README.md

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 [![Documentation badge](https://img.shields.io/badge/Documentation-ff69b4)](https://hexdocs.pm/ch)
 [![Hex.pm badge](https://img.shields.io/badge/Package%20on%20hex.pm-informational)](https://hex.pm/packages/ch)
 
-Minimal HTTP ClickHouse client for Elixir.
+Minimal HTTP [ClickHouse](https://clickhouse.com) client for Elixir.
 
 Used in [Ecto ClickHouse adapter.](https://github.com/plausible/ecto_ch)