[Tile-serving] [osm2pgsql] Update CREATE EXTENSION information (#24)

[Andy Allan]

Is there an argument for clarifying the existing README? There could be some confusion for e.g. current ubuntu releases, which have 9.1 and 1.5.

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https://github.com/openstreetmap/osm2pgsql/pull/24#issuecomment-17796211
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