Support for borderBottomLeftRadius, borderBottomRightRadius etc. in ProgressBar

[mafiusu]

Hello I want to set the Border Radius for each corner individual and not use the prop borderRadius for all corners.

Additional Props for the ProgressBar:

• borderBottomLeftRadius
• borderBottomRightRadius
• borderTopLeftRadius
• borderTopRightRadius

Is something like this coming in near feature? I would like to make a PR if this gets merged then.

[martin-richter-uk]

That would be very useful.