'Real' Zero when setting sliceSpace
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- Dominant language
- Swift
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Description
## What did you do?
I created a pie chart with 6 slices and set `sliceSpace = 0`.
## What did you expect to happen?
I expected to have a pie chart with **no** spacing between the slices.
## What happened instead?
Each slice is separated by a very small but still noticeable space (as seen below).

## Charts Environment
**Charts version/Branch/Commit Number: 3.3.0**
**Xcode version: 11.0**
**Swift version: 5**
**Platform(s) running Charts: iOS 12.3**
**macOS version running Xcode: 10.14.5**
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