handle panics

[kamilsk]

not handled panic in goroutines
	if err := func() (err error) {
		defer grace.Recover(&err)
		err = cmd.RootCmd.Execute()
		return
	}(); err != nil {
if goroutine has recover then data race is appeared

...
==================
Found 1 data race(s)
exit status 66
make: *** [cmd-urls] Error 1