This release adds a couple minor features: easier access to the underlying compressed file within the EPUB archive and ability to obtain its compressed length.
Unfortunately, the logging feature that was also expected to be in this release had to be delayed until EpubReader drops support for .NET Framework 4.6 and .NET Standard 1.3 because .NET logging Nuget package does not support them.
Coming next: preliminary support for EPUB 3.4 standard (the full support will be available once EPUB 3.4 specification moves out the draft stage and EPUB WG publishes the first Candidate Recommendation).