omnisharp-vim source for ddc.vim
https://github.com/Shougo/ddc.vim
https://github.com/vim-denops/denops.vim
https://github.com/OmniSharp/omnisharp-vim
call ddc#custom#patch_global('sources', ['omnisharp-vim'])
call ddc#custom#patch_global('sourceOptions', {
\ 'omnisharp-vim': {'mark': 'OMNI'},
\ })