Merge pull request #399 from Microsoft/nizarq

updated changelog.md:

Author: nizarq

CHANGELOG.md

@@ -4,7 +4,7 @@ This changelog will be used to generate documentation on [release notes page](ht
 
 ## Version 2.3.0-beta1
 - Added metric aggregation functionality via MetricManager and Metric classes.
-- Added the ability to correlate http request made between different components represented by different application insights resources.
+- Exposed a source field on RequestTelemetry. This can be used to store a representation of the component that issued the incoming http request. 
 
 ## Version 2.2.0
 - Includes all changes since 2.1.0 stable release.