message: Update Angular 2 example
diff: # Usage with Angular 2 & TypeScript
  -An example Angular 2 configuration:
  +Create `error_handler.ts`:
  ```TypeScript
  -class AirbrakeErrorHandler implements ErrorHandler {
  - airbrake: airbrakeJs.Client;
  +import { ErrorHandler } from '@angular/core';
  +import AirbrakeClient from 'airbrake-js';
  +
  +export class AirbrakeErrorHandler implements ErrorHandler {
  + airbrake: AirbrakeClient;
  constructor() {
  - this.airbrake = new airbrakeJs.Client({
  + this.airbrake = new AirbrakeClient({
  projectId: 1,
  projectKey: 'FIXME'
  });
  }
  - handleError(error) {
  - airbrake.notify(error);
  + handleError(error: any): void {
  + this.airbrake.notify(error);
  }
  }
  +```
  +
  +Add `ErrorHandler` provider to your `AppModule`:
  +
  +```TypeScript
  +import { BrowserModule } from '@angular/platform-browser';
  +import { NgModule, ErrorHandler } from '@angular/core';
  +
  +import { AppComponent } from './app.component';
  +import { AirbrakeErrorHandler } from './error_handler';
  @NgModule({
  - providers: [{provide: ErrorHandler, useClass: AirbrakeErrorHandler}]
  + declarations: [
  + AppComponent
  + ],
  + imports: [
  + BrowserModule
  + ],
  + providers: [{provide: ErrorHandler, useClass: AirbrakeErrorHandler}],
  + bootstrap: [AppComponent]
  })
  -
  -class MyModule {}
  +export class AppModule { }
  ```
  