Merge pull request #66 from dhalbert/doc-fix

fix doc API build

Author: tannewt

docs/conf.py

@@ -30,6 +30,7 @@
 # autodoc module docs will fail to generate with a warning.
 autodoc_mock_imports = [
     "audioio",
+    "bitmaptools",
     "displayio",
     "neopixel",
     "analogio",