Feature request: Provide the "elevation" parameter to be able to clear the RaisedButton's elevation

[contactjavas]

Hi! thanks for this great package!

Would you open to provide extra constructor paramater to ProgressButton class? Sometime, the design of the app giving us clean RaisedButton (without elevation / box shadow effect). Providing elevation as another parameter for the ProgressButton class would help a lot.

I can submit PR if you would like. Thanks for your attention :)

Regards,
Bagus

[contactjavas]

Alright, now is 2022.
I published easy_loading_button package based on this flutter_progress_button.
It implements null safety and the elevation option.

This might be useful for people who like the simplicity of this package but need null safety.
Related issues: #8 #9 #10