message: Update the angular 2 doc
  I plan to pull this README.md into airbrake-docs so we only need to
  manage the configuration for Angular 2 instructions in a single
  location.
  I updated the code blocks to use `ts` instead since the docs site does
  not perform correct highlighting with `TypeScript` specified.
  More details:
diff: -# Usage with Angular 2 & TypeScript
  +### Usage with Angular 2 & TypeScript
  -Create `error_handler.ts`:
  +### Create an error handler
  +The first step is to create an error handler with an `AirbrakeClient`
  +initialized with your `projectId` and `projectKey`. In this example the
  +handler will be in a file called `error_handler.ts`.
  -```TypeScript
  +```ts
  import { ErrorHandler } from '@angular/core';
  import AirbrakeClient from 'airbrake-js';
  @@ -22,9 +25,12 @@ export class AirbrakeErrorHandler implements ErrorHandler {
  }
  ```
  -Add `ErrorHandler` provider to your `AppModule`:
  +### Add the error handler to your `AppModule`
  -```TypeScript
  +The last step is adding the `ErrorHandler` to your `AppModule`, then your app
  +will be ready to report errors to Airbrake.
  +
  +```ts
  import { BrowserModule } from '@angular/platform-browser';
  import { NgModule, ErrorHandler } from '@angular/core';
  @@ -43,3 +49,4 @@ import { AirbrakeErrorHandler } from './error_handler';
  })
  export class AppModule { }
  ```
  +
  