fix: require('health') is deprecated

[Allen191819]

In the new version, require('health') is replaced by vim.health.

[creativenull]

Hmm I don't see any deprecation warnings on 0.7 but see them on nightly only.

I don't really want to break compatibility with the stable release, so it would be best if you could add a condition to use vim.health if the version is 0.8 but drop down to the require('health') otherwise.

Something of the following at the top:

local health = nil

if vim.fn.has('0.8') == 1 then
  health = vim.health
else
  health = require('health')
end

[creativenull]

I know I'm really late to this but was wondering why this was closed?

You're still welcome to make the PR to ensure deprecation warnings aren't shown on 0.8, now that is it the stable nvim release :)