CSharp-SDK - 3.1.0

May 9th, 2019

### New Features: * Introduced Decision notification listener to be able to record: * Variation assignments for users activated in an experiment. * Feature access for users. * Feature variable value for users.

### Bug Fixes: * Feature variable APIs return default variable value when featureEnabled property is false. ([#151](https://github.com/optimizely/csharp-sdk/pull/151))

### Deprecated: * Activate notification listener is deprecated as of this release. Recommendation is to use the new Decision notification listener. Activate notification listener will be removed in the next major release.

https://github.com/optimizely/csharp-sdk/releases/tag/v3.1.0