Update text_editors.rst

[romainl]

Add mention of Vim's native support.

The file currently lists two third-party plugins that allow using yamllint in Vim via their custom mechanism. Those plugins are popular because:

1. they generally offer a more refined experience than the native way,
2. they abstract thework of defining filetype/linter-specific options.

Now, Vim actually comes with its own mechanism for defining those filetype/linter-specific options: compiler scripts.

Since there is a compiler script for yamllint distributed with Vim (I wrote it), this commit adds a third alternative to the list that doesn't require users to install third-party plugins.

[coveralls]

coverage: 99.824%. remained the same
when pulling 91181d9 on romainl:patch-1
into e427005 on adrienverge:master.

[adrienverge]

Hello,

• Can you precise what this "compiler script" is about, and how this commit which "adds mention of Vim's native support" is different from the already-existing paragrah "yamllint is supported by default"?

  (please explain this in the commit message)

• Have you tried compiling the RST files? Does it render correctly? I'm surprised because generally, the :: shouldn't be indented the same as the code snippet inside.

  To keep things short, it's probably best to avoid such :: blocks and use inline snippets instead.

[romainl]

Hello,

• I added the context you asked for. Is it clear enough?

• I only previewed the file in GitHub, where it seemed OK to me.

  It was an attempt to have the code block properly indented under the preceding bullet point.