Wrong offset for Mongolia

[Daniela Duerbeck]

Hello!

The tz database states +9 for Mongolia, but +8 is correct:

Time Differences 
Most of Mongolia is 8 hours ahead of GMT. However, the three western
aimags of Khovd, Uvs and Bayan Ulgii are GMT+7. Mongolia no longer puts
forward its clocks by 1 hour in the summer months.

Found on:
http://www.mongoliatourism.gov.mn/fackpack.html

Many greetings from Dani