Update on Angular 9

[nihaadk]

Issue Type:

• Bug
• [x ] Feature
• Help

Version & Environment:

Description:

I think they are very good, can update this Lib on Angular 9. I can not used with the last version of angular.

[shishenbaiye]

change ModuleWithProviders to ModuleWithProviders<T = any>

[shishenbaiye]

and change the import Observable path to "rxjs"