Version number & changelog on web page is radically out of date

[masukomi]

on https://jwt.github.io/ruby-jwt/ it currently says

Current version: 1.5.6

and the last changelog update was 2016-09-19

[excpt]

Yes. This page could use some love. It got left behind the code issues. There is already something brewing in the background but I think this will take until June.

[anakinj]

#629 changed the github pages to get updated with the yard docs from the main branch.