Deprecated function used in example in readme

[fira42073]

local has_words_before = function()
  if vim.api.nvim_buf_get_option(0, "buftype") == "prompt" then return false end
  local line, col = unpack(vim.api.nvim_win_get_cursor(0))
  return col ~= 0 and vim.api.nvim_buf_get_text(0, line-1, 0, line-1, col, {})[1]:match("^%s*$") == nil
end

should be replaced with

local has_words_before = function()
	if vim.api.nvim_get_option_value("buftype", { buf = 0 }) == "prompt" then return false end
	local line, col = unpack(vim.api.nvim_win_get_cursor(0))
	return col ~= 0 and vim.api.nvim_buf_get_text(0, line - 1, 0, line - 1, col, {})[1]:match("^%s*$") == nil
end

Because nvim_buf_get_option is deprecated.