doc: release note

docs/release-notes/release-notes-0.18.0.md

@@ -390,6 +390,9 @@ bitcoin peers' feefilter values into account](https://github.com/lightningnetwor
   decoupled into logical steps, with each step having its own responsibility,
   making it easier to reason about the payment flow.
 
+* [Remove io/ioutil package 
+  dependence](https://github.com/lightningnetwork/lnd/pull/7765).
+
 * [Add a watchtower tower client
   multiplexer](https://github.com/lightningnetwork/lnd/pull/7702) to manage
   tower clients of different types.