Release Name: BrainFlow 4.9.0 (4.9.0)

Notes:
### Summary

* `get_version()` method - [#417](https://github.com/brainflow-dev/brainfl...)
* `calc_stddev()` method - [#403](https://github.com/brainflow-dev/brainfl...)
* `release_all()` method - [#402](https://github.com/brainflow-dev/brainfl...)
* Updated SimpleBLE library with bug fixes for Linux
* Support for Muse2016