v2.0.0-beta1 released

[Ricardo Quesada]

Hi,

I've just released v2.0.0-beta:

Download:
https://github.com/ricardoquesada/bluepad32/releases/tag/release_v2.0.0-beta1

Changelog:
## [2.0.0-beta1] - 2020-11-30

- uni_bluetooth: added "auto-delete" to prevent having "orphan"
connections forever
- AirLift:
- Multi-core code fixed.
- Added "bluepad32.py" library (tools/circuitpython/)
- Added more samples/tests in tools/circuitpython/
- Gamepads: Provide 3 properties (when avaiable):
- Setting player LEDs
- Setting LED color (DS4, DualSense)
- Rumble
- DualShock4: Supports Rumble (WIP) + any color can be set to the LED
- DualShock3: Supports players LEDs + Rumble
- DualShock3: Fix button mappings. A <-> B, X <-> Y
- XboxOne: Suports Rumble
- Switch: Supports rumble (WIP)
- tools: each tool in its own directory.
- tools/circuitpython: Added "snake", a "real" game that showcases the gamepad
- ESP-IDF sdkconfig:
- Bluetooth Controller: BR/EDR ACL Max Connections: 7 (max value)
- Bluetooth Controller: BR/EDR Sync (SCO/eSCO) Max Connections: 3 (max value)