Update Changelog

Author: grlima

CHANGELOG.md

@@ -1,8 +1,11 @@
 # CHANGELOG
 
 ## Version 2.0.0
-
-- Fix #506 Null Reference Check causing Null Pointer Exception in `TelemetryCorrelationUtils.java`
+- Upgraded logback dependency version to 1.2.3
+- Improved FixedRateSampling so that it also supports Sampling Percentage set by users programmatically. Fixes [issue #535] (https://github.com/Microsoft/ApplicationInsights-Java/issues/535)
+- Fault Tolerance improvements: introducing retries and exponential backoff capabilities with disk persistence.
+- [Issue #499](https://github.com/Microsoft/ApplicationInsights-Java/pull/499): Fix handling of NaN and +/-Infinity in JSON serializer
+- [Issue #506] (https://github.com/Microsoft/ApplicationInsights-Java/pull/506): Null Reference Check causing Null Pointer Exception in `TelemetryCorrelationUtils.java`
 
 ## Version 2.0.0-BETA
 - Updating various dependencies to latest version