eon v0.2.3

eon 0.2.3

Say what KEEP does where the database is created

TDengine drops rows older than the database's KEEP window, and the server
default is 3650 days. Backfill more history than that and the rows are refused
one by one with "Timestamp data out of range" — at write time, long after the
database was created, with nothing pointing back at KEEP. It reads like a data
problem and is not.

ensureDatabase is where KEEP is set, so it is where that belongs; the option
itself and the config stub say it too.

34b2a83

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Changes since v0.2.2.