[tz] Typo in africa timezone file

[Marcel Telka]

In https://www.ietf.org/timezones/data/africa I found the following lines:

# From Gunther Vermier (2015-05-13):
# our Egypt office confirms that the change will be at 15 May "midnight" (24:00)

I think the timestamp (2015-05-13) is not correct there.
Should it say 2014-05-13 instead?

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| Marcel Telka   e-mail:   marcel at telka.sk  |
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