docs: set version for upcoming release's update notes

Author: echozio

README.md

@@ -171,7 +171,7 @@ If you have functions persistent storage or identity stitching data you wish to
 `redis.enabled` to `true` to enable "double read" mode as outlined in the [release notes for Jitsu
 v2.5.0](https://github.com/jitsucom/jitsu/releases/tag/jitsu2-v2.5.0).
 
-### TODO: TBD
+### v1.6.0
 This release splits the `config.clickhouseHost` and `config.clickhouseHostFrom` parameters up into
 separate parameters for HTTP and TCP, as different components require different protocols. If you
 were using these parameters, simply set `config.clickhouseHttpHost` and `config.clickhouseTcpHost`