Not compatible with esp32 3.0.0

[WePraiseTheSun]

I tried compiling it with latest version, it starts complaining quite a few thing such as

Servo.h:68:54: error: 'SOC_LEDC_TIMER_BIT_WIDE_NUM' was not declared in this scope; did you mean 'SOC_LEDC_TIMER_BIT_WIDTH'?
...

if I switch back to esp32 2.0.17, it works fine.