Octoprint-nanny

* Fix exception raised in websocket client


File "/home/leigh/projects/OctoPrint/.venv/lib/python3.7/site-packages/octoprint_nanny/clients/websocket.py", line 19, in <module>
from octoprint_nanny.utils.encoder import NumpyEncoder
ModuleNotFoundError: No module named 'octoprint_nanny.utils'

* Add bump2version to dev requirements

* Added [HoneyComb tracing](https://www.honeycomb.io/) :bee:

New Features & Functionality
* Replace HTTP telemetry in v0.1.0 with MQTT-based telemetry
* Provision device identity through [Google Cloud IoT Core](https://cloud.google.com/iot-core)

Bug Fixes
* Fixes 18, which was caused by inconsistent plugin naming.