doc: Generate version from installed cycler

Author: QuLogic

doc/source/conf.py

@@ -65,10 +65,10 @@
 # |version| and |release|, also used in various other places throughout the
 # built documents.
 #
-# The short X.Y version.
-version = '0.12.0'
 # The full version, including alpha/beta/rc tags.
-release = '0.12.0.dev0'
+from cycler import __version__ as release  # noqa
+# The short X.Y version.
+version = '.'.join(release.split('.')[:2])
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.