fix: ⚠️ WARNING vim.validate{<table>} is deprecated.

[chocolord]

Hi

This solves this checkheakth warning (cf: :checkhealth vim.deprecated):

- ⚠️ WARNING vim.validate{<table>} is deprecated. Feature will be removed in Nvim 1.0
  - ADVICE:
    - use vim.validate(<params>) instead.

Regards

[khaneliman]

#112