FreeBSD/doc a94633e (r53123)share/xml events2019.xml

Add OSCon 2019 to the list of events.

Submitted by:       Deb Goodkin
Approved by:        bcr
Event:              Vienna Hackathon 2019
Differential Revision:  https://reviews.freebsd.org/D20558
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+21-0share/xml/events2019.xml
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