Changelog for zip-0.1.2

Zip 0.1.2

Relaxed dependency on semigroups.
Added explicit check of “version needed to extract”, so if archive uses some advanced features that we do not support yet, parsing fails.
Value of “version needed to extract” field is now calculated dynamically with respect to actually used features, e.g. if you just store or deflate a not very big file, 2.0 version will be written (previously we wrote 4.6 unconditionally). This is needed to avoid scaring tools that can only handle basic Zip archives.