Add UPGRADE <version_number> as an option to UPGRADE. #213
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specified is higher than our current one.
This allows a "cmnd/<group_topic>/upgrade 3.1.13" to be issued repeatedly
to cause tardy devices to upgrade via the OTAURL, but cause no interruption
to devices already running the specified version (or newer).
e.g. "UPGRADE 1xx" & "UPGRADE 1.2.3" would always trigger an update.