message: Improve AngularJS example
diff: # Usage with AngularJS
  -Integration with AngularJS is as simple as adding an
  -[$exceptionHandler](https://docs.angularjs.org/api/ng/service/$exceptionHandler):
  +Integration with AngularJS is as simple as adding an [$exceptionHandler][1]:
  ```js
  -angular
  - .module('app')
  - .factory('$exceptionHandler', function ($log) {
  - var airbrake = new Notifier({
  +// app.js
  +const module = angular.module('app', []);
  +
  +module.factory('$exceptionHandler', function ($log) {
  + const airbrake = new Airbrake.Notifier({
  projectId: 1, // Airbrake project id
  - projectKey: 'FIXME' // Airbrake project API key
  + projectKey: 'FIXME', // Airbrake project API key
  });
  airbrake.addFilter(function (notice) {
  @@ -22,4 +22,29 @@ angular
  airbrake.notify({ error: exception, params: { angular_cause: cause } });
  };
  });
  +
  +module.controller('HelloWorldCtrl', function ($scope) {
  + throw new Error('Uh oh, something happened');
  +
  + $scope.message = 'Hello World';
  +});
  ```
  +
  +```html
  +<!-- index.html -->
  +<!DOCTYPE html>
  +<html ng-app="app">
  + <head>
  + <meta charset="utf 8" />
  + <title>Hello World</title>
  + </head>
  + <body>
  + <h1 ng-controller="HelloWorldCtrl">{{message}}</h1>
  + <script src="https://code.angularjs.org/1.8.2/angular.js"></script>
  + <script src="https://cdn.jsdelivr.net/npm/@airbrake/browser"></script>
  + <script src="app.js"></script>
  + </body>
  +</html>
  +```
  +
  +[1]: https://docs.angularjs.org/api/ng/service/$exceptionHandler
  