EPUBCheck intermediate 4.1 release

As announced in EPUBCheck revision initialized post, a maintenance release of EPUBCheck as been published in time by the DAISY Consortium.

This version 4.1.0 includes various improvements and bug fixes that have been contributed over the past two years. See https://github.com/w3c/epubcheck/releases

The Steering Committee of the Publishing Business Group at W3C wants to thank the DAISY Consortium and all version 4.1.0 contributors for this first milestone of EPUBCheck revision.

And now, en route for EPUB 3.2 validation.

You can still continue to support this work by contributing to the fundraising call at https://www.w3.org/blog/2018/10/epubcheck-fundraising/