[Tile-serving] [openstreetmap/osm2pgsql] Add travis, appveyor, and repology badges to README.md (#983)

[mmd]

Yes, I do realize I was a bit late to the party, yet I thought I'd better add a comment before I forget about it.

-- 
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/983#issuecomment-555896055
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstreetmap.org/pipermail/tile-serving/attachments/20191120/8b63df3b/attachment.html>