chore: prepare for release 3.4.0 (#236)

* prepare for release 3.4.0

Author: jaeopt

CHANGELOG.md

@@ -1,13 +1,24 @@
 # Optimizely Ruby SDK Changelog
 
+## 3.4.0
+January 23rd, 2020
+
+### New Features:
+- Added a new API to get a project configuration static data.
+  - Call `get_optimizely_config` to get a snapshot copy of project configuration static data.
+  - It returns an `OptimizelyConfig` instance which includes a datafile revision number, all experiments, and feature flags mapped by their key values.
+  - Added caching for `get_optimizely_config` - `OptimizelyConfig` object will be cached and reused for the lifetime of the datafile
+  - For details, refer to a documention page: https://docs.developers.optimizely.com/full-stack/docs/optimizelyconfig-ruby
+
+
 ## 3.3.2
 December 13th, 2019
 
 ### Bug Fixes:
 - BatchEventProcessor will hang on poll after flushing with no event if no event count is greater than 3 [#224](https://github.com/optimizely/ruby-sdk/pull/224).
 - EventDispatcher logs debug response and error responses from http post call i[#221](https://github.com/optimizely/ruby-sdk/pull/221).
 
-# New Features
+### New Features
 - NotificationCenter should accept any Callable [#219](https://github.com/optimizely/ruby-sdk/pull/219).
 
 ## 3.3.1

lib/optimizely/version.rb

@@ -17,5 +17,5 @@
 #
 module Optimizely
   CLIENT_ENGINE = 'ruby-sdk'
-  VERSION = '3.3.2'
+  VERSION = '3.4.0'
 end