Read version string for docs from version_info.py

docs/build/conf.py

@@ -56,14 +56,20 @@
 author = u'Jan Funke, Renate Krause, Julia Buhmann, Rodrigo Ceballos Lentini, William Grisaitis, Chris Barnes, Caroline Malin-Mayor, Larissa Heinrich, Philipp Hanslovsky, Sherry Ding, Andrew Champion, Arlo Sheridan, Constantin Pape'
 copyright = u'2019, ' + author
 
+here = os.path.abspath(os.path.dirname(__file__))
+version_info = {}
+with open(os.path.join(here, '..', '..', 'gunpowder', 'version_info.py')) as fp:
+    exec(fp.read(), version_info)
+gp_version = version_info['_version']
+
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
 # built documents.
 #
 # The short X.Y version.
-version = u'0.3'
+version = u'{}.{}'.format(gp_version.major(), gp_version.minor())
 # The full version, including alpha/beta/rc tags.
-release = u'0.3'
+release = str(gp_version)
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.