No documentation shown in Neovim with nvim-compe completion plugin

[gegoune]

Describe the bug
hrsh7th/nvim-compe is a completion plugin for Neovim. It integrates with Neovim's built in LSP client (nightly builds only). For other language servers it does show documentation for completion item. It does not do that for lua-language-server. Plugin's author suspects it's due to the way your server works. I have no knowledge of inner workings of language servers, so though I will open an issue just to start the discussion. Please see authors response to issue: hrsh7th/nvim-compe#109

To Reproduce
Not sure if you even have Neovim installed, please let me know if you do and will then provide minimal init file to reproduce problem.

Expected behavior
Show documentation while completion menu is displayed and completion candidate item is selected.

Environment (please complete the following information):

• OS: macOS
• Client: neovim

[gegoune]

It works, thanks a lot!