Remove unused interrupt pin arg and doc updates #34
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Addresses #33 with some minor doc updates for good measure.
These changes don't have any effect on the example code or the function of the library. The only thing that the incoming
interrupt_pinarg used to do was to set an internal variable that was never actually used.An alternative approach would be to update the doc to indicate that we want a
DigtalInOutrather than aPin. Given that it isn't used, I've started with this PR. Feel free to reject the PR if this approach isn't appropriate. :)