Don't trow an error when books_on_join and books_on_first_join config keys are set to a single string (delimited by quotes) instead of a list of strings (delimited by square brackets)
Now the books are parsed with the MiniMessage library; there is a new (but similar) syntax for writing books, the old one has been re-implemented for retro compatibility, but will be removed in the future, so you should upgrade you existing books: check the wiki
Added automatic reloading of the config and the books
Fixed a bug with serialization of the book generation of books created via command
Improved the parser, now to insert a newline character, you have to use "<br>" instead of "\n", and angle brackets characters can be inserted by using the html codes
Added support for Bukkit 1.8.3 - 1.8.8, sorry but I couldn't add support for 1.8 - 1.8.2 because in this version a Bukkit class for creating this kind of books isn't public, therefore is not visible and I don't know an alternative, if exists