`williamboman/nvim-lsp-installer` no longer maintained.

[Lazerbeak12345]

I think it'd be wise to recommend the successor instead.

Quote from their readme:

ℹ️ Project status

This is an excerpt from the announcement here.
nvim-lsp-installer is no longer maintained.

mason.nvim is the next generation version of nvim-lsp-installer. It
builds on top of the very same foundation as nvim-lsp-installer (which means it's easy to migrate), but with a
majority of internals refactored to improve extensibility and testability.

More importantly, the scope of mason.nvim has also been widened to target more than just LSP servers. mason.nvim
supports DAP servers, linters, formatters, and more. As of writing, mason.nvim provides 150+ packages for 100+
languages. It can be thought of as a general-purpose package manager, native to Neovim, that runs everywhere Neovim runs
(Windows, macOS, Linux, etc.).

Another big change with mason.nvim is that executables are now linked to a single, shared, location, allowing seamless
access from Neovim builtins (shell, terminal, etc.) as well as other 3rd party plugins.

There have also been other improvements such as broader test coverage, more documentation, and a revamped UI - check it
out!

I might be able to rewrite your readme for you, but I don't know how this impacts your code.

[tamago324]

We welcome pull request!

[Lazerbeak12345]

I re-read the code. Unless I'm mistaken, we're good now.