v0.9.0

The basic functions are ready

Now support:

• read raw angle (uint16_t)
• read normalized angle, ranging from -1.0 to 1.0
• read angle in radian, ranging from -pi to pi
• allow user to customize the scale factor and offset for the get() method
• allow user to change the output mode to PWM and config PWM parameters

Todo:

• read magnet status and strength
• add burn function