Update 0.9.0-rc2 release notes

Author: romanz

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "electrs"
-version = "0.9.0-rc1"
+version = "0.9.0-rc2"
 authors = ["Roman Zeyde <me@romanzey.de>"]
 description = "An efficient re-implementation of Electrum Server in Rust"
 license = "MIT"

Cargo.toml

@@ -1,11 +1,5 @@
 # 0.9.0 (TBD)
 
-* Prevent panic during logging of p2p messages (#490)
-* Don't collect process' Prometheus metrics by default (#492)
-* Support initial sync resume (#494)
-
-# 0.9.0-rc1 (Sep 17 2021)
-
 **IMPORTANT: This release contains major changes, please read carefully!**
 
 The two main things to watch out for:
@@ -17,6 +11,14 @@ See [upgrading](doc/usage.md#upgrading) section of our docs to learn more.
 
 Full list of changes:
 
+## 0.9.0-rc2 (Sep 23 2021)
+
+* Prevent panic during logging of p2p messages (#490)
+* Don't collect process' Prometheus metrics by default (#492)
+* Support initial sync resume (#494)
+
+## 0.9.0-rc1 (Sep 17 2021)
+
 * Fix incorrect ordering of same-block transactions (#297)
 * Change DB index format and use Zstd compression (instead of Snappy)
 * The database will be reindexed automatically when it encounters old version (#477)