[docs] Bump the trunk major version to 13 and update copyright year.
diff --git a/libcxx/docs/conf.py b/libcxx/docs/conf.py
index c58b187..5516cdb 100644
--- a/libcxx/docs/conf.py
+++ b/libcxx/docs/conf.py
@@ -11,6 +11,7 @@
# serve to show the default.
import sys, os
+from datetime import date
# If extensions (or modules to document with autodoc) are in another directory,
# add these directories to sys.path here. If the directory is relative to the
@@ -40,7 +41,7 @@
# General information about the project.
project = u'libc++'
-copyright = u'2011-2020, LLVM Project'
+copyright = u'2011-2021, LLVM Project' % date.today().year
# The version info for the project you're documenting, acts as replacement for
# |version| and |release|, also used in various other places throughout the
