[tz] draft of change summary for next tz release

[Lester Caine]

Guy Harris wrote:
> The only historical information associated with them is the date when the old names were deprecated, which has nothing to do with the history of time zones.
The date it was first used is important as well ... both of which are just 
pulled from the release history.

-- 
Lester Caine - G8HFL
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