How to use didTapped and didLongTapped

Hello,

I am developing an app in that I have to use two types of floating button in which one will normal that shown in the demo and one is only plus icon button so how to use didtapped of LiquidFloatingActionButton.
I have seen [#20](https://github.com/yoavlt/LiquidFloatingActionButton/issues/20#issue-115000400) but I don't get anything.
Also, add that in demo example.
