Merge pull request #54 from launchdarkly/dr/changelog

Add changelog

Author: drichelson

CHANGELOG.md

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+# Change log
+
+All notable changes to the LaunchDarkly Python SDK will be documented in this file. This project adheres to [Semantic Versioning](http://semver.org).
+
+## [2.0.0] - 2016-08-10
+### Added
+- Support for multivariate feature flags. `variation` replaces `toggle` and can return a string, number, dict, or boolean value depending on how the flag is defined.
+- New `all_flags` method returns all flag values for a specified user.
+- New `secure_mode_hash` function computes a hash suitable for the new LaunchDarkly [JavaScript client's secure mode feature](https://github.com/launchdarkly/js-client#secure-mode).
+
+### Deprecated
+- The `toggle` call has been deprecated in favor of `variation`.
+ 
+### Removed
+- Twisted support has temporarily been removed.
+