Update TypeScript documentation (4.2.2)

Author: simon04

assets/javascripts/templates/pages/about_tmpl.coffee

@@ -818,7 +818,7 @@ credits = [
     'https://twig.symfony.com/license'
   ], [
     'TypeScript',
-    '2012-2020 Microsoft',
+    '2012-2021 Microsoft',
     'Apache',
     'https://raw.githubusercontent.com/Microsoft/TypeScript-Handbook/master/LICENSE'
   ], [

lib/docs/scrapers/typescript.rb

@@ -4,7 +4,7 @@ class Typescript < UrlScraper
 
     self.name = 'TypeScript'
     self.type = 'simple'
-    self.release = '4.1.3'
+    self.release = '4.2.2'
     self.base_urls = [
       'https://www.typescriptlang.org/docs/handbook/',
       'https://www.typescriptlang.org/'
@@ -35,7 +35,7 @@ def initial_urls
     ]
 
     options[:attribution] = <<-HTML
-      &copy; 2012-2020 Microsoft<br>
+      &copy; 2012-2021 Microsoft<br>
       Licensed under the Apache License, Version 2.0.
     HTML