source: fix year in conf

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>
diff --git a/source/conf.py b/source/conf.py
index 325e655..06b219b 100644
--- a/source/conf.py
+++ b/source/conf.py
@@ -20,7 +20,7 @@
 # -- Project information -----------------------------------------------------
 
 project = 'Apache CloudStack'
-copyright = '2012-2020, Apache Foundation'
+copyright = '2012-2021, Apache Foundation'
 author = 'Apache CloudStack Project'
 
 # The short X.Y version