fix: hack the lua package.path for VimPlug

[ngdangdat]

Related issue

#52

Description

• Execute Lua command to add hlslens.lua location to package.path

How to test

• Pull the branch
• Configure VimPlug with the pulled branch. E.g: Plug '~/learn/repos/nvim-hlslens'
• Restart NeoVim
• Execute lua command to check if the hlslens package is recognized :lua require("hlslens").setup(nil, true)

References

• https://www.linode.com/docs/guides/write-a-neovim-plugin-with-lua/#vim-script-component

[kevinhwang91]

Hacking the rtp is bad, I think to add a doc section for vim-plug to add rtp is better.