Missing in Readme: FormsModule is needed

[glutengo]

The tag can only be used if the FormsModule was imported in the app module, especially when including the ngModel binding. If the FormsModule is not imported, I get this error:
Uncaught Error: Template parse errors:
Can't bind to 'ngModel' since it isn't a known property of 'json-editor'.

Please add this to your Readme file.