Emacs 25.3 says this is an obsolete package...

Emacs 25.3 (on Ubuntu) says:

vue-html-mode is an obsolete package.

Status: Obsolete in ‘vue-html-mode-20180104.1421/’ (unsigned).
Version: 20180104.1421
Summary: Major mode for editing Vue.js templates
Homepage: http://github.com/AdamNiederer/vue-html-mode
Keywords: languages vue template
Other versions: 20180104.1421 (melpa).

I tried uninstalling and reinstalling, but that didn't help.

I haven't been able to understand what makes a package obsolete (or 'incompat'), and was wondering if you knew, or if there was some action I needed to take to make this package work again on my emacs.