docs: post-release version bump

docs/conf.py

@@ -52,7 +52,7 @@ copyright = '2015-2018, Project Gluon'
 # 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.
-version = release = '2018.2'
+version = release = '2018.2+'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.

docs/site-example/site.conf

--- This is an example site configuration for Gluon v2018.2
+-- This is an example site configuration for Gluon v2018.2+
 --
 -- Take a look at the documentation located at
 -- https://gluon.readthedocs.io/ for details.