Update copyrights to 2021

(cherry picked from commit 0a087e730f58a502be6c071930af0903de17a432)

_extensions/godot_descriptions.py

@@ -6,7 +6,7 @@
     Sphinx extension to automatically generate HTML meta description tags
     for all pages. Also comes with some special support for Godot class docs.
 
-    :copyright: Copyright 2020 by The Godot Engine Community
+    :copyright: Copyright 2021 by The Godot Engine Community
     :license: MIT.
 
     based on the work of Takayuki Shimizukawa on OpenGraph support for Sphinx,

community/contributing/code_style_guidelines.rst

@@ -158,8 +158,8 @@ Example:
     /*                           GODOT ENGINE                                */
     /*                      https://godotengine.org                          */
     /*************************************************************************/
-    /* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
-    /* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md)    */
+    /* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
+    /* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
     /*                                                                       */
     /* Permission is hereby granted, free of charge, to any person obtaining */
     /* a copy of this software and associated documentation files (the       */
@@ -203,8 +203,8 @@ Example:
     /*                           GODOT ENGINE                                */
     /*                      https://godotengine.org                          */
     /*************************************************************************/
-    /* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
-    /* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md)    */
+    /* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
+    /* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
     /*                                                                       */
     /* Permission is hereby granted, free of charge, to any person obtaining */
     /* a copy of this software and associated documentation files (the       */

conf.py

@@ -79,7 +79,7 @@ master_doc = "index"
 # General information about the project
 project = "Godot Engine"
 copyright = (
-    "2014-2020, Juan Linietsky, Ariel Manzur and the Godot community (CC-BY 3.0)"
+    "2014-2021, Juan Linietsky, Ariel Manzur and the Godot community (CC-BY 3.0)"
 )
 author = "Juan Linietsky, Ariel Manzur and the Godot community"