Using clangd lsp

[ryan-ph]

I installed llvm through brew, and have the following in my vimrc, but calling completor#do("definition") and completor#do("doc") do nothing. Also auto-completion seems to be exactly the same with or without the lsp enabled.

let g:completor_filetype_map = {
    \ 'cpp':   {'ft': 'lsp', 'cmd': 'clangd'},
    \ }