updated license headers and changelog

CHANGELOG.md

@@ -25,7 +25,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
--
+- Django templates for email and user guide (<https://github.com/openvinotoolkit/cvat/pull/2412>)
 
 ### Security
 

cvat/apps/documentation/templates/documentation/base_page.html

 <!--
-    Copyright (C) 2018 Intel Corporation
+    Copyright (C) 2018-2020 Intel Corporation
 
     SPDX-License-Identifier: MIT
 -->

cvat/apps/documentation/templates/documentation/user_guide.html

 <!--
-    Copyright (C) 2018 Intel Corporation
+    Copyright (C) 2018-2020 Intel Corporation
 
     SPDX-License-Identifier: MIT
 -->

cvat/apps/documentation/templates/documentation/xml_format.html

 <!--
-    Copyright (C) 2018 Intel Corporation
+    Copyright (C) 2018-2020 Intel Corporation
 
     SPDX-License-Identifier: MIT
 -->