Sync zoneinfo database with tzdata2018i from ftp://ftp.iana.org/tz/releases
* Qyzylorda, Kazakhstan moved from +06 to +05 on 2018-12-21.
* New zone Asia/Qostanay because Qostanay, Kazakhstan didn't move.
* Metlakatla, Alaska observes PST this winter only.
* Guess Morocco will continue to adjust clocks around Ramadan.
* Add predictions for Iran from 2038 through 2090.
* São Tomé and Príncipe switches from +01 to +00 on 2019-01-01.
For a detailed list of changes, see share/zoneinfo/NEWS.
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