Update release in docs

Signed-off-by: Dimitris Aragiorgis <dimara@grnet.gr>

docs/conf.py

@@ -50,7 +50,7 @@ copyright = u'2010-2013, GRNET S.A. All rights reserved'
 # The short X.Y version.
 version = '0.12'
 # The full version, including alpha/beta/rc tags.
-release = '0.12.2'
+release = '0.12.3'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.