Unused? Reference to Arduino_Sensor.h

[V3]

Hi!

I just found out that this project doesn't compile due to an maybe unused reference. In file Adafruit_SI5351.h line 44:

include <Adafruit_Sensor.h>

which doesn't seem to be used anywhere, after commenting out everything compiled nicely.
So maybe you could update the code :)

Thx and cool project!

[Kevin Townsend]

Removed, thanks. That was a leftover from early development.