[Azure Monitor OpenTelemetry Exporter]Update changelog for 1.0.0-beta…

….5 release (Azure#18038)

* Update changelog

* Update sdk/monitor/monitor-opentelemetry-exporter/CHANGELOG.md

Co-authored-by: KarishmaGhiya <kghiya8@gmail.com>

* Update sdk/monitor/monitor-opentelemetry-exporter/CHANGELOG.md

Co-authored-by: KarishmaGhiya <kghiya8@gmail.com>

* Format

Co-authored-by: KarishmaGhiya <kghiya8@gmail.com>

sdk/monitor/monitor-opentelemetry-exporter/CHANGELOG.md

@@ -1,15 +1,15 @@
 # Release History
 
-## 1.0.0-beta.5 (Unreleased)
-
-### Features Added
-
-### Breaking Changes
+## 1.0.0-beta.5 (2021-10-05)
 
 ### Bugs Fixed
 
+- Fixed issue with SDK version field not being populated correctly.
+
 ### Other Changes
 
+- Updated mapping for Azure Monitor according to latest specs.
+
 ## 1.0.0-beta.4 (2021-07-07)
 
 - Updating OpenTelemetry API to 1.0.0