Add __version__ attribute. (#68)

Author: Adminiuga

setup.py

@@ -2,9 +2,11 @@
 
 from setuptools import find_packages, setup
 
+import zigpy_deconz
+
 setup(
     name="zigpy-deconz",
-    version="0.2.2",
+    version=zigpy_deconz.__version__,
     description="A library which communicates with Deconz radios for zigpy",
     url="http://github.com/zigpy/zigpy-deconz",
     author="Daniel Schmidt",

zigpy_deconz/__init__.py

@@ -0,0 +1,6 @@
+# coding: utf-8
+MAJOR_VERSION = 0
+MINOR_VERSION = 3
+PATCH_VERSION = '0'
+__short_version__ = '{}.{}'.format(MAJOR_VERSION, MINOR_VERSION)
+__version__ = '{}.{}'.format(__short_version__, PATCH_VERSION)