modifying the changelog file to add entry for PR #869

Author: sanketmehta28

Diff for: CHANGELOG.md

@@ -6,6 +6,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased](https://github.com/open-telemetry/opentelemetry-python/compare/v1.8.0-0.27b0...HEAD)
+- `opentelemetry-instrumentation-pyramid` Pyramid: Conditionally create SERVER spans
+  ([#869](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/869))
 
 ### Added