Agent - 2.6.0

## [2.6.0] - Jan 13, 2022

- Introduce `Forced Decisions` property into the `decide` API for overriding and managing user-level flag, experiment and delivery rule decisions. Forced decisions can be used for QA and automated testing purposes ([#324](https://github.com/optimizely/agent/pull/324), [#325](https://github.com/optimizely/agent/pull/325)).

- For details, refer to our API documentation page: https://library.optimizely.com/docs/api/agent/v1/index.html#operation/decide.
- Upgrade to use [Go SDK v1.8.0](https://github.com/optimizely/go-sdk/releases/tag/v1.8.0). This adds support for Forced Decisions.

https://github.com/optimizely/agent/releases/tag/v2.6.0