Graph not plotting data correctly
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- Dominant language
- Swift
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Description
## What did you do?
Plotted data
## What did you expect to happen?
Graph to look clean and filled correctly
How it should look:

## What happened instead?
The start point and end point cut through the graph
How it should not look:

## Charts Environment
**Charts version/Branch/Commit Number:** 3.3.0
**Xcode version:** 10.2
**Swift version:** 5
**Platform(s) running Charts:** iOS 12.2
**macOS version running Xcode:** 10.14.4
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