requirements.txt is missing 2 dependent libraries from the list

[jwcooper]

adafruit_stmpe610:

Adafruit_CircuitPython_FeatherWing/adafruit_featherwing/tft_featherwing_35.py

Line 23 in 310708d

from adafruit_hx8357 import HX8357

adafruit_hx8357:

Adafruit_CircuitPython_FeatherWing/adafruit_featherwing/tft_featherwing.py

Line 22 in 310708d

from adafruit_stmpe610 import Adafruit_STMPE610_SPI

This was noticed while trying to run the following tutorial code:
https://learn.adafruit.com/touch-deck-diy-tft-customized-control-pad/code-the-touch-deck
https://github.com/adafruit/Adafruit_Learning_System_Guides/blob/master/CircuitPython_Touch_Deck/code.py#L14

[makermelissa]

I noticed it was also missing the ili9341 and st7735r libraries.