Swiping away last card on the stack causes the animation to glitch

[JoniVR]

New Issue Checklist

• [x] I updated VerticalCardSwiper to the latest version.
• [x] I read the Contribution Guidelines.
• [x] I read the documentation.
• [x] I searched for existing GitHub issues.

Issue Description

When you are at the end of the stack and still have some cards left, swiping away the last card will cause the animation to glitch. This is probably something that needs to be fixed inside the updateCellAttributes function.

Example:

Environment

• iOS Version: any
• Device(s): any
• Xcode Version: 10.1

edit: Stackoverflow Question