message: Update README.md
  Fix Demo source link
diff: @@ -70,7 +70,7 @@ export class AppModule { }
  ```
  -You may also find it useful to view the [demo source](https://github.com/paradox41/ng-chartist/blob/master/demo/demo.ts).
  +You may also find it useful to view the [demo source](https://github.com/willsoto/ng-chartist/blob/master/demo/demo.ts).
  ### Usage without a module bundler
  ```
  