chore: Prepare 1.2.0 release. (#263)

Author: Michael Ng

CHANGELOG.MD

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ## [Unreleased]
 Changes that have landed but are not yet released.	Changes that have landed but are not yet released.
 
+## [1.2.0] - May 21st, 2020
+## New Features
+- feat: support for multi-rule rollouts [#247](https://github.com/optimizely/go-sdk/pull/247)
+
 ## [1.1.3] - April 22th, 2020
 ## Bug Fix
 - logger not set for httpDispatcher [#254](https://github.com/optimizely/go-sdk/pull/254)

pkg/event/version.go

@@ -18,7 +18,7 @@
 package event
 
 // Version is the current version of the client
-var Version = "1.1.3"
+var Version = "1.2.0"
 
 // ClientName is the name of the client
 var ClientName = "go-sdk"