chore(*): update copyright year

Closes #16386
@@ -1,6 +1,6 @@
 The MIT License

-Copyright (c) 2010-2017 Google, Inc. http://angularjs.org
+Copyright (c) 2010-2018 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
@@ -209,7 +209,7 @@ <h4 class="search-results-group-heading">{{ key }}</h4>
        <p class="pull-right"><a back-to-top>Back to top</a></p>

        <p>
-          Super-powered by Google ©2010-2017
+          Super-powered by Google ©2010-2018
          (<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">
@@ -1,6 +1,6 @@
 /**
 * @license AngularJS v"NG_VERSION_FULL"
- * (c) 2010-2017 Google, Inc. http://angularjs.org
+ * (c) 2010-2018 Google, Inc. http://angularjs.org
 * License: MIT
 */
 (function(window) {
@@ -1,6 +1,6 @@
 /**
 * @license AngularJS v"NG_VERSION_FULL"
- * (c) 2010-2017 Google, Inc. http://angularjs.org
+ * (c) 2010-2018 Google, Inc. http://angularjs.org
 * License: MIT
 */
 'use strict';
@@ -1,6 +1,6 @@
 /**
 * @license AngularJS v"NG_VERSION_FULL"
- * (c) 2010-2017 Google, Inc. http://angularjs.org
+ * (c) 2010-2018 Google, Inc. http://angularjs.org
 * License: MIT
 */
 (function(window, angular) {