Trivial documentation bug in README.md

[tomparkin]

README.md has the following example:

func main() {
	// get clock ticks, this will return the same as C.sysconf(C._SC_CLK_TCK)
	clktck, err := sysconf.Sysconf(sysconf.SC_CLK_TCK)
	if err != nil {
		fmt.Printf("SC_CLK_TCK: %v\n", clktck)
	}
}

I think the if block should execute if there is no error, i.e. if err == nil.

Currently the example is printing the value of clktck if an error occurred.

[tklauser]

Thanks! Pushed 9251390 with a fix.