chore(*): update copyright year to 2020

Closes #16930

LICENSE

@@ -1,6 +1,6 @@
 The MIT License
 
-Copyright (c) 2010-2019 Google, Inc. http://angularjs.org
+Copyright (c) 2010-2020 Google, Inc. http://angularjs.org
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

docs/config/templates/app/indexPage.template.html

@@ -222,7 +222,7 @@
         <p class="pull-right"><a back-to-top>Back to top</a></p>
 
         <p>
-          Super-powered by Google ©2010-2018
+          Super-powered by Google ©2010-2020
           (<a id="version"
                ng-href="https://github.com/angular/angular.js/blob/master/CHANGELOG.md#{{versionNumber}}"
                ng-bind-template="v{{version}}" title="Changelog of this version of AngularJS">

src/angular.prefix

@@ -1,6 +1,6 @@
 /**
  * @license AngularJS v"NG_VERSION_FULL"
- * (c) 2010-2018 Google, Inc. http://angularjs.org
+ * (c) 2010-2020 Google, Inc. http://angularjs.org
  * License: MIT
  */
 (function(window) {

src/loader.prefix

@@ -1,6 +1,6 @@
 /**
  * @license AngularJS v"NG_VERSION_FULL"
- * (c) 2010-2018 Google, Inc. http://angularjs.org
+ * (c) 2010-2020 Google, Inc. http://angularjs.org
  * License: MIT
  */
 'use strict';

src/module.prefix

@@ -1,6 +1,6 @@
 /**
  * @license AngularJS v"NG_VERSION_FULL"
- * (c) 2010-2018 Google, Inc. http://angularjs.org
+ * (c) 2010-2020 Google, Inc. http://angularjs.org
  * License: MIT
  */
 (function(window, angular) {