Update README concerning new IANA versioning

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Howard Hinnant 2016-09-28 18:17:26 -04:00 committed by GitHub
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IMPORTANT UPDATE:
Recently IANA changed how they reported the database version. If you have `AUTO_DOWNLOAD` enabled in the tz library, you must update to include this commit:
https://github.com/HowardHinnant/date/commit/19c83e47ed411a45e0b5a45d772c47c6ee23ac3f
Without this update your tz lib will download a new copy of the database everytime you start your program.
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_**[Try it out on wandbox!](http://melpon.org/wandbox/permlink/lb6FHxHyQ1V9eCLm)**_ _**[Try it out on wandbox!](http://melpon.org/wandbox/permlink/lb6FHxHyQ1V9eCLm)**_
This is actually several separate C++11/C++14 libraries: This is actually several separate C++11/C++14 libraries: