hyperapp version

Newbie here, two questions regarding versions:

• the releases page (https://github.com/jorgebucaran/hyperapp/releases) tags 1.2.9 as "latest", does that mean 2.x is not production ready ? are there still breaking changes planned ?
• the same page shows the latest available as 2.0.0 but npm has 2.0.20, is there a changelog somewhere ?

Basically what version should a new project go for and where is that documented

Thanks!