Pass successPercent to format prop on Progress Component.

[joshuapinter]

• I have searched the issues of this repository and believe that this is not a duplicate.

What problem does this feature solve?

The Progress Component can accept a successPercent prop to show a segment of the total progress that is complete or "successful". However, this successPercent is not passed to the format prop function so it can not currently be used to display a custom format. Only the percent value is passed to the format prop function.

What does the proposed API look like?

I would pass the successPercent as a second parameter to the format prop function. This way it can optionally be accessed. It would look something like this:

<Progress 
  percent={60} 
  successPercent={30} 
  format={ (percent, successPercent) => successPercent + "% Efficient" />