[tz] SGT abbreviation is missing from the IANA tz database

[Lu, Can]

Hi Paul,

Hope you're well. By way of introduction, this is Can, working as a software developer in BAML.

We noticed that Asia/Singapore had its SGT abbreviation dropped in tzdb 2017, and the reason being is that the zone abbreviation doesn't correspond to any real-world usage. But it's actually not entirely true, SGT is very commonly used in Singapore and it's also a standard abbreviation for Singapore time. Please refer to: https://en.wikipedia.org/wiki/List_of_time_zone_abbreviations and https://en.wikipedia.org/wiki/List_of_time_zone_abbreviations

Wondering if it's possible to add SGT back to IANA db as I believe this change will cause breaks to other libraries rely on it. (We're using pytz for python development). I am happy to discuss and appreciate any thoughts you may have on it.

Thanks,
Can

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