how to use gopls with oni

[0xgirish]

Oni Version: 0.3.9
Neovim Version (Linux only):
Operating System: MacOS High Sierra

Issue: In favor of Google's Go language server, gopls, development of go-langserver have been deprioritized. Please add instruction for gopls on wiki.
(I am a newbie and this is the first issue I have ever created on GitHub)

[oni-bot]

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