bump 1.6.7 to allow listening firehose/substreams on multiple addresses

CHANGELOG.md

@@ -8,9 +8,9 @@ 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
+## v1.6.7
 
-* `firehose-grpc-listen-addr` flag now accepts comma-separated addresses (allows listening as plaintext and snakeoil-ssl at the same time or on specific ip addresses)
+* `firehose-grpc-listen-addr` and `substreams-tier1-grpc-listen-addr` flags now accepts comma-separated addresses (allows listening as plaintext and snakeoil-ssl at the same time or on specific ip addresses)
 * removed old `RegisterServiceExtension` implementation (not used anywhere anymore)
 * rpc-poller lib: fix fetching the first block on an endpoint (was not following the cursor, failing unnecessarily on non-archive nodes)