Update to angular v15

[ChristofFritz]

I know I'm rather early with that but ngx-toastr is throwing an error while building after the update to angular 15.

This is the error:

   Type '<T>(token: any, notFoundValue?: T, flags?: InjectFlags) => T | ToastPackage' is not assignable to type '{ <T>(token: ProviderToken<T>, notFoundValue: undefined, options: InjectOptions & { optional?: false; }): T; <T>(token: ProviderToken<T>, notFoundValue: null, options: InjectOptions): T; <T>(token: ProviderToken<...>, notFoundValue?: T, options?: InjectOptions | InjectFlags): T; <T>(token: ProviderToken<...>, notFou...'.
     Types of parameters 'flags' and 'options' are incompatible.
       Type 'InjectOptions & { optional?: false; }' is not assignable to type 'InjectFlags'.

 47     get<T>(token: any, notFoundValue?: T, flags?: InjectFlags): T | ToastPackage; ```

[scttcper]

🎉 This issue has been resolved in version 16.0.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀