docs: update copyright year in sphinx's conf.py

docs/conf.py

@@ -47,7 +47,7 @@ master_doc = 'index'
 
 # General information about the project.
 project = 'Gluon'
-copyright = '2015-2017, Project Gluon'
+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