doc - Use version from __about__

Author: phibos

docs/source/conf.py

@@ -57,9 +57,10 @@
 # built documents.
 #
 # The short X.Y version.
-version = '0.1'
+from overpy import __about__ as overpy_about
+version = overpy_about.__version__
 # The full version, including alpha/beta/rc tags.
-release = '0.1'
+release = overpy_about.__version__
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.