internal: replace error messages from 'io.write' to 'io.stderr:write'

lua/fzf-lua/make_entry.lua

@@ -40,7 +40,7 @@ local function load_config_section(s, datatype)
       vim.fn.chanclose(chan_id)
     end)
     if not ok then
-      io.write(("Error loading remote config section '%s': %s\n")
+      io.stderr:write(("Error loading remote config section '%s': %s\n")
         :format(s, errmsg))
     elseif type(res) == datatype then
       return res

lua/fzf-lua/shell_helper.lua

@@ -64,6 +64,6 @@ local success, errmsg = pcall(function ()
 end)
 
 if not success then
-  io.write("FzfLua Error:\n\n" .. errmsg .. "\n")
+  io.stderr:write("FzfLua Error:\n\n" .. errmsg .. "\n")
   vim.cmd [[qall]]
 end