Xo: Vim plugin

[sindresorhus]

Follow-up to https://github.com/sindresorhus/xo/issues/28 and https://github.com/vim-syntastic/syntastic/pull/1561.

Seems it's now possible to create a Vim plugin and have Syntastic pickup the bundled linter definition.

From the Syntastic readme:

4.14. Q. What happened to the rustc checker?

A. It is now part of the rust.vim plugin. If you install this plugin the checker should be picked up automatically by syntastic.

Example: https://github.com/rust-lang/rust.vim/blob/master/syntax_checkers/rust/rustc.vim

Docs: https://github.com/vim-syntastic/syntastic/wiki/Syntax-Checker-Guide#external

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I have no experience with Vim. Anyone wanna make a XO plugin?

[sindresorhus]

Now available: https://github.com/sindresorhus/vim-xo