Wrong error message for non-async dependency

[rhalff]

It seems the error message is wrong when a non-async dependency is added to the dependsOn list when using registerSingletonAsync.

e.g:

..registerSingletonAsync<MyAsyncService>(
  () => MyAsyncService()..init(),
   dependsOn: [
      MySyncService,
   ],
)

Would give:

Invalid argument(s): Dependent Type MySyncService is an async Singleton

In this case MySyncService is a non-async singleton.

It should probably read: "is not an async Singleton"

[escamoteur]

Thanks for spotting. Fixed in next version