Fix broken changelog entries

Author: ackintosh

protocols/upnp/CHANGELOG.md

@@ -1,15 +1,7 @@
-## 0.7.1
-
-- Fix panic with "mapping should exist".
-  See [PR 6459](https://github.com/libp2p/rust-libp2p/pull/6459)
-
-## 0.7.0
-
-- Raise MSRV to 1.88.0.
 ## 0.7.0
 
 - Raise MSRV to 1.88.0.
-See [PR 6273](https://github.com/libp2p/rust-libp2p/pull/6273).
+  See [PR 6273](https://github.com/libp2p/rust-libp2p/pull/6273).
 
 - Fix panic with "mapping should exist".
   See [PR 6459](https://github.com/libp2p/rust-libp2p/pull/6459)