update docs: add noisy signal models

Author: CedarGroveStudios

README.rst

@@ -22,8 +22,8 @@ RangeSlicer is a general-purpose CircuitPython analog value converter that linea
 
 .. image:: https://github.com/CedarGroveStudios/CircuitPython_RangeSlicer/blob/master/media/range_slicer_models.png
    :alt: RangeSlicer Signal Models
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 The effect of using hysteresis to clean up a noisy signal:
 
 .. image:: https://github.com/CedarGroveStudios/CircuitPython_RangeSlicer/blob/master/media/range_slicer_noise_models.png