updated README; moved Trellis note from index.rst

Author: sommersoft

README.rst

@@ -12,8 +12,14 @@
 This is a library for using the I²C-based LED matrices with the HT16K33 chip.
 It supports both 16x8 and 8x8 matrices, as well as 7- and 14-segment displays.
 
-Note this library is intended for Adafruit CircuitPython's API.  For a library
-compatible with MicroPython machine API see this library: https://github.com/adafruit/micropython-adafruit-ht16k33
+**Notes**
+
+#. This library is intended for Adafruit CircuitPython's API.  For a library
+compatible with MicroPython machine API see this `library <https://github.com/adafruit/micropython-adafruit-ht16k33>`_.
+
+#. Note: This library does not work with the Trellis 4x4 LED+Keypad board. For that product use:
+
+     `CircuitPython Trellis Library <https://github.com/adafruit/Adafruit_CircuitPython_Trellis/releases/latest>`_
 
 Dependencies
 =============