Update CHANGELOG.md

added version 2.3.1 changes

Author: littleaj

Diff for: CHANGELOG.md

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 # CHANGELOG
 
+# Version 2.3.1
+- Fixed [#799](https://github.com/Microsoft/ApplicationInsights-Java/issues/799) Removed dependency on Guava vulnerable to [CVE-2018-10237](https://nvd.nist.gov/vuln/detail/CVE-2018-10237).
+
 # Version 2.3.0
 - Introducing Application Insights SpringBoot Starter 1.1.1 (GA VERSION).
 - Fix [#784](https://github.com/Microsoft/ApplicationInsights-Java/issues/784) Shade guava dependency.