Update Bootstrap documentation (5.0)

assets/javascripts/templates/pages/about_tmpl.coffee

@@ -128,7 +128,7 @@ credits = [
     'https://raw.githubusercontent.com/petkaantonov/bluebird/master/LICENSE'
   ], [
     'Bootstrap',
-    '2011-2020 Twitter, Inc.<br>2011-2020 The Bootstrap Authors',
+    '2011-2021 Twitter, Inc.<br>2011-2021 The Bootstrap Authors',
     'CC BY',
     'https://creativecommons.org/licenses/by/3.0/'
   ], [

lib/docs/scrapers/bootstrap.rb

@@ -10,8 +10,8 @@ module Docs
 
     # https://github.com/twbs/bootstrap/blob/master/LICENSE
     options[:attribution] = <<-HTML
-      &copy; 2011&ndash;2020 Twitter, Inc.<br>
-      &copy; 2011&ndash;2020 The Bootstrap Authors<br>
+      &copy; 2011&ndash;2021 Twitter, Inc.<br>
+      &copy; 2011&ndash;2021 The Bootstrap Authors<br>
       Code licensed under the MIT License.<br>
       Documentation licensed under the Creative Commons Attribution License v3.0.
     HTML