[tz] Europe/Volgograd change from UTC+3 to UTC+4 from 28oct2018

[Paul Eggert]

Thanks for the heads-up. As it looks much more likely that this change will 
happen than it won't, I installed the attached patch into the development 
version on GitHub. Presumably we should generate a new tzdb release soon after 
the Volgograd change becomes official, if we haven't generated one already.

It's too bad the Russian officials aren't giving us much notice.
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