Require blinka displayio for doc gen

tannewt · tannewt · commit 10672eb3d1b2 · 2023-01-30T13:32:23.000-08:00
diff --git a/requirements.txt b/requirements.txt
@@ -4,3 +4,4 @@
 # SPDX-License-Identifier: MIT
 
 Adafruit-Blinka
+adafruit-blinka-displayio
