prepare release v1.6.0

CHANGELOG.md

@@ -8,7 +8,7 @@ Operators, you should copy/paste content of this content straight to your projec
 
 If you were at `firehose-core` version `1.0.0` and are bumping to `1.1.0`, you should copy the content between those 2 version to your own repository, replacing placeholder value `fire{chain}` with your chain's own binary.
 
-## Unreleased
+## v1.6.0
 
 * Add `sf.firehose.v2.EndpointInfo/Info` service on Firehose and `sf.substreams.rpc.v2.EndpointInfo/Info` to Substreams endpoints. This involves the following new flags:
   - `advertise-chain-name` Canonical name of the chain according to https://thegraph.com/docs/en/developing/supported-networks/ (required, unless it is in the "well-known" list)