chore: Prepare 3.3.0 release. (#203)

Author: Michael Ng

CHANGELOG.md

@@ -1,7 +1,7 @@
 # Optimizely Ruby SDK Changelog
 
 ## 3.3.0
-September 20th, 2019
+September 26th, 2019
 
 ### New Features:
 - Added non-typed `get_feature_variable` method ([#190](https://github.com/optimizely/ruby-sdk/pull/190)) as a more idiomatic approach to getting values of feature variables.

lib/optimizely/version.rb

@@ -17,5 +17,5 @@
 #
 module Optimizely
   CLIENT_ENGINE = 'ruby-sdk'
-  VERSION = '3.2.0'
+  VERSION = '3.3.0'
 end