Version bump to 0.73.0.dev0

homeassistant/const.py

 # coding: utf-8
 """Constants used by Home Assistant components."""
 MAJOR_VERSION = 0
-MINOR_VERSION = 72
+MINOR_VERSION = 73
 PATCH_VERSION = '0.dev0'
 __short_version__ = '{}.{}'.format(MAJOR_VERSION, MINOR_VERSION)
 __version__ = '{}.{}'.format(__short_version__, PATCH_VERSION)