ntplib
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Add `NTPRolloverException`, raised when system time is beyond NTPv3 r…
…ollover.
NTPv3 has a rollover in 2036 - see https://en.wikipedia.org/wiki/Network_Time_Protocol#Timestamps. Raise a specific exception if the system time is beyond that rollover, to make it easier for users to understand what the problem is.
Closes #18.