nvim: Specify root markers for language client

Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>

nvim/init.vim

@@ -209,6 +209,7 @@ let g:LanguageClient_serverCommands = {
     \ 'rust': ['/usr/bin/rustup', 'run', 'stable', 'rls'],
 	\ 'python': ['/usr/bin/pyls'],
     \ }
+let g:LanguageClient_rootMarkers = ['*.cabal', 'stack.yaml', 'Cargo.toml']
 
 nnoremap <Leader>lc :call LanguageClient_contextMenu()<CR>
 nnoremap <Leader>lh :call LanguageClient#textDocument_hover()<CR>