Ruby-SDK - 3.3.2

## 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
- NotificationCenter should accept any Callable [#219](https://github.com/optimizely/ruby-sdk/pull/219).

https://github.com/optimizely/ruby-sdk/releases/tag/3.3.2