refactor(iferr): use vim.notify

i have tried to use _utils.runner, but i cannt figure out how to make `< file.go` for the command

lua/gopher/iferr.lua

@@ -1,22 +1,17 @@
 local c = require("gopher.config").commands
-local u = require "gopher._utils"
 local iferr = {}
 
 -- That's Lua of vimscript implementation of: github.com/koron/iferr
-iferr.iferr = function()
+function iferr.iferr()
   local boff = vim.fn.wordcount().cursor_bytes
-  local cmd = (c.iferr .. " -pos " .. boff)
-  local data = vim.fn.systemlist(cmd, vim.fn.bufnr "%")
+  local pos = vim.fn.getcurpos()[2]
 
+  local data = vim.fn.systemlist((c.iferr .. " -pos " .. boff), vim.fn.bufnr "%")
   if vim.v.shell_error ~= 0 then
-    u.deferred_notify(
-      "command " .. cmd .. " exited with code " .. vim.v.shell_error,
-      vim.log.levels.ERROR
-    )
+    vim.notify("iferr failed: " .. data, vim.log.levels.ERROR)
     return
   end
 
-  local pos = vim.fn.getcurpos()[2]
   vim.fn.append(pos, data)
   vim.cmd [[silent normal! j=2j]]
   vim.fn.setpos(".", pos)