neovim deprecations for `vim.validate{<table>}`

[neurosnap]

Greetings!

First, awesome plugin, thanks for maintaining it!

I'm running neovim nightly and there are some deprecation warnings coming from this plugin.

vim.deprecated:                                                           1 ⚠️

 ~
- ⚠️ WARNING vim.validate{<table>} is deprecated. Feature will be removed in Nvim 1.0
  - ADVICE:
    - use vim.validate(<params>) instead.
    - stack traceback:
        .local/share/nvim/site/pack/core/opt/gitlinker.nvim/lua/gitlinker/async.lua:175
       .local/share/nvim/site/pack/core/opt/gitlinker.nvim/lua/gitlinker/async.lua:238
        [C]:-1
        .local/share/nvim/site/pack/core/opt/gitlinker.nvim/lua/gitlinker.lua:7
        [C]:-1
        .config/nvim/init.lua:194
    - stack traceback:
        .local/share/nvim/site/pack/core/opt/gitlinker.nvim/lua/gitlinker/async.lua:175
        .local/share/nvim/site/pack/core/opt/gitlinker.nvim/lua/gitlinker/git.lua:47
        [C]:-1
        .local/share/nvim/site/pack/core/opt/gitlinker.nvim/lua/gitlinker/linker.lua:5
        [C]:-1
       .local/share/nvim/site/pack/core/opt/gitlinker.nvim/lua/gitlinker.lua:10
        [C]:-1
        .config/nvim/init.lua:194
    - stack traceback:
        .local/share/nvim/site/pack/core/opt/gitlinker.nvim/lua/gitlinker/async.lua:157
        .local/share/nvim/site/pack/core/opt/gitlinker.nvim/lua/gitlinker.lua:276
        [C]:-1
        .config/nvim/init.lua:194