message: fixed usage description
diff: @@ -19,10 +19,10 @@ You can [catch us on twitter](https://twitter.com/recogizer): [@recogizer](https
  Import `angular-gauge-chart` into your module and add as a declaration.
  ```typescript
  -import { GaugeChartComponent } from 'angular-gauge-chart'
  +import { GaugeChartModule } from 'angular-gauge-chart'
  -declarations: [
  - GaugeChartComponent,
  +imports: [
  + GaugeChartModule,
  ]
  ```
  