misc: update copyright date

Change-Id: I0813c17c7afe5331c7288ced15266b9e033f845e
diff --git a/build-plugin.py b/build-plugin.py
index 6190afd..4c6e5de 100644
--- a/build-plugin.py
+++ b/build-plugin.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 #
-# Copyright (C) 2020 Savoir-faire Linux Inc.
+# Copyright (C) 2020-2021 Savoir-faire Linux Inc.
 #
 # Author: Aline Gondim Santos <aline.gondimsantos@savoirfairelinux.com>
 #