Add back entry

Author: aumetra

opentelemetry-appender-log/CHANGELOG.md

@@ -7,6 +7,7 @@
 ## v0.4.0
 
 - Add log key-values as attributes [#1628](https://github.com/open-telemetry/opentelemetry-rust/pull/1628)
+- Update `opentelemetry` dependency version to 0.23
 
 ## v0.3.0