Added busdevice dependancy to setup.py

Author: evaherrada

setup.py

@@ -34,7 +34,7 @@
     # Author details
     author="Adafruit Industries",
     author_email="[email protected]",
-    install_requires=["Adafruit-Blinka",],
+    install_requires=["Adafruit-Blinka", "adafruit-circuitpython-busdevice",],
     # Choose your license
     license="MIT",
     # See https://pypi.python.org/pypi?%3Aaction=list_classifiers