Update changelog

Author: Dan Richelson

CHANGELOG.md

@@ -3,6 +3,10 @@
 
 All notable changes to the LaunchDarkly Java SDK will be documented in this file. This project adheres to [Semantic Versioning](http://semver.org).
 
+## [2.0.0] - 2016-08-08
+### Removed
+- Removed slf4j from default artifact: [#71](https://github.com/launchdarkly/java-client/issues/71)
+
 ## [2.0.0] - 2016-08-08
 ### Added
 - Support for multivariate feature flags. New methods `boolVariation`, `jsonVariation` and `intVariation` and `doubleVariation` for multivariates.