[Tile-serving] [osm2pgsql] Update the README (#40)

[pnorman]

Update the readme to refer to 9.1+2.0 by default.
Information for older versions remains as an alternative.
You can merge this Pull Request by running:

  git pull https://github.com/pnorman/osm2pgsql example_docs

Or you can view, comment on it, or merge it online at:

  https://github.com/openstreetmap/osm2pgsql/pull/40

-- Commit Summary --

  * Update the README

-- File Changes --

    M README (37)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/40.patch
https://github.com/openstreetmap/osm2pgsql/pull/40.diff

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