Update LICENSE.txt

Author: zoracon

LICENSE.txt

@@ -1,5 +1,5 @@
 HTTPS Everywhere:
-Copyright © 2010-2018 Electronic Frontier Foundation and others
+Copyright © 2010-2021 Electronic Frontier Foundation and others
 Licensed GPL v2+
 
 HTTPS Everywhere Rulesets (src/chrome/content/rules):
@@ -12,4 +12,4 @@ Issue Format Bot (utils/issue-format-bot/*):
 Copyright © 2017 AJ Jordan, AGPLv3+
 
 The build system incorporates code from Python 3.6 and Python 3 respectively
-Copyright © 2001-2018 Python Software Foundation; All Rights Reserved
+Copyright © 2001-2018 Python Software Foundation; All Rights Reserved