Update changelog.

Author: imanshafiei540

CHANGELOG.md

@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+- Fix `Invalid type NoneType for attribute X  (opentelemetry-instrumentation-aws-lambda)` error when some attributes do not exist
+  ([#1780](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/1780))
+
 ## Version 1.18.0/0.39b0 (2023-05-10)
 
 - `opentelemetry-instrumentation-system-metrics` Add `process.` prefix to `runtime.memory`, `runtime.cpu.time`, and `runtime.gc_count`. Change `runtime.memory` from count to UpDownCounter. ([#1735](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/1735))
@@ -39,8 +42,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([#1738](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/1738))
 - Fix `None does not implement middleware` error when there are no middlewares registered
   ([#1766](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/1766))
-- Fix `Invalid type NoneType for attribute X  (opentelemetry-instrumentation-aws-lambda)` error when some attributes do not exist
-  ([#1780](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/1780))
 
 ## Version 1.17.0/0.38b0 (2023-03-22)