Rescript in neovim

Hey,

since language server version 1.62 or 1.63 you have to track for file changes by your own.
So you can add the capabilities field to the lsp config:

capabilities = {
    workspace = {
        didChangeWatchedFiles = {
            dynamicRegistration = true,
        },
    },
}

After adding this config, the lsp will update the errors after saving files.

If you use nvim-lspconfig, I added this information to their wiki (nvim-lspconfig/doc/configs.md at master · neovim/nvim-lspconfig · GitHub) and will add the config as default after the release of rescript 12.