clarification of "zero dependencies"

[thunder7553]

Issue description

The README says that it has "Zero Dependencies", but the nuget package does install IronCompress.1.6.3 (and Snappier and ZsdrSharp) in a .net9 project.

What does "zero dependencies" actually refer to?

[aloneguid]

IronCompress is my library and was probably introduced in the last major version. Others are transitive dependencies of IronCompress and are optional.