https://github.com/mpeterv/luacheck/pull/81#issuecomment-261099606

> If you really want to use bleeding-edge version you should get the
> rockspec from master branch, not a fixed commit ...
> The correct way to install from a specific commit is cloning that
> commit and running "luarocks make" from project directory. The reason
> is that running "install" or "build" on an scm rockspec fetches
> sources from master but uses build description from the rockspec
> itself, which may be outdated.

* health.vim: Include v:throwpoint in error message

* health/provider.vim: Check for ruby executable

* health/provider.vim: Combine subprocess stdout and stderr

* test: Updated CheckHealth test

Also:

- improve precision of "No healthcheck found"
- fix SUGGESTIONS syntax group definition
- fix indentation of SUGGESTIONS

To healthcheck the "foo" plugin:
    :CheckHealth foo
To healthcheck the "foo" and "bar" plugins:
    :CheckHealth foo bar
To run all auto-discovered healthchecks:
    :CheckHealth

- Overlay markdown syntax/filetype, don't invent new filetypes/syntaxes.
- migrate s:check_ruby()
- s:indent_after_line1
- Less-verbose output

- Use execute() instead of redir
- Fixed logic on suboptimal pyenv/virtualenv checks.
- Move system calls from strings to lists. Fixes #5218
- Add highlighting
- Automatically discover health checkers
- Add tests

Helped-by: Shougo Matsushita <Shougo.Matsu@gmail.com>
Helped-by: Tommy Allen <tommy@esdf.io>

Closes #4932