0.13.1

This is a bugfix release that fixes an edge case with the use of trimValueWhitespaces configuration on XMLDecoder, and adds official Windows support for users of Swift 5.5. Many thanks to @MartinP7r for multiple contributions to this release!

Closed issues:

• Encoding an Attribute doesn't work anymore (#231)
• How to "skip" certain XML tags / element in a TCX file (#227)
• Encode element with empty key, no elements, and attributes (#224)

Merged pull requests:

• Add Windows to GitHub Actions CI build matrix (#233) via @MaxDesiatov
• Add test for preserved spaces with XML entities (#234) via @MartinP7r
• Fix trimValueWhitespaces removing needed white-spaces (#226) via @MartinP7r
• Remove some of the SwiftLint generated warnings (#229) via @MartinP7r
• Remove unneeded parameter key (#225) via @MartinP7r