Updated config-pin

I have created an update of Philip Munts’ config-pin. Specifically, I enhanced the -q option to give all of the output the earlier shell version did and enabled the control of pull-up/-down resistors by adding a + or - sign after “in” or “output”. Now what?

Should I follow the standard GitHub procedure for creating a pull request for all of RobertCNelson/bb.org-overlays? That seems like overkill for a such small contribution.