v2.8.1

PR: #97

This release:

• Fixes Destination is too short error (#81) (aloneguid/parquet-dotnet#413)
• Fixes a bug where you couldn't open files with struct fields (#95)
• Columns with forward slashes in their name will now work (#94) (#96)

To be able to use the executable .NET Desktop Runtime 7 must be installed on your machine.