- version bump

- Additional logging for ping logic.

- Fixed repository.

enable debug for CI

fix _fingerprint is set checks for ESP32

see Links2004#633 and Links2004#632

Merge branch 'eio_4_ping_handling'

EIO=4 ping handling Links2004#611

version.py can now create WebSocketsVersion.h

bionic is broken for Arduino IDE 1.6.13 so we keep xenial

travis