Cannot parse EPUB books using XHTML 1.1.

[eskwayrd]

2018/04/13 00:03:05 [21/116] Error indexing /books/pirate_cinema.epub: xml: unsupported version "1.1"; only version 1.0 is supported

Seems like a limitation of the core xml package. Many EPUBs don't use XHTML 1.1, but I suspect more will as time passes. No worries if this can't be addressed for a while, but I thought reporting it was worthwhile.

[pgaskin]

If I parse it as HTML instead, it should technically work, but it may cause bugs with some epubs. I'll leave it this way for now.