Was setDrawRoundedSlices migrated?

* [x] I've read, understood, and done my best to follow the [*CONTRIBUTING guidelines](https://github.com/jjatie/Charts/blob/master/CONTRIBUTING.md).

## What did you do?

Can't see [setDrawRoundedSlices](https://github.com/PhilJay/MPAndroidChart/commit/42cdba535f5af8076f3a376afba543c7e41eb9d0) property

## What did you expect to happen?

Set rounded edges for chart view

## What happened instead?

Property is missed

## Charts Environment

**Charts version/Branch/Commit Number:** 3.3.0
**Xcode version:** 10.2.1
**Swift version:** 5
**Platform(s) running Charts:** iOS 12
**macOS version running Xcode:**

Start by locating the Swift implementation of chart slice rendering and compare it with the setDrawRoundedSlices behavior referenced in the linked MPAndroidChart commit. Verify the expected rounded-edge behavior on Charts 3.3.0 with Swift 5 and iOS 12, then confirm it works in the affected chart view.

Written by the indexing model from the issue text.