add async.vim in README's requirements

lighttiger2505 / deoplete-vim-lsp

deoplete source for vim-lsp

MIT License

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Closed get-me-power closed 5 years ago

get-me-power commented 5 years ago

Since there was no description of async.vim in the requirement part of README, it added.

lighttiger2505 commented 5 years ago

Thank's for contribution. Merged.