[Tile-serving] [osm2pgsql] Readme updates. (#509)

[Jochen Topf]

Fix some typos in README and remove duplicate reference to dev mailing list.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/509

-- Commit Summary --

  * Readme updates.

-- File Changes --

    M README.md (11)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/509.patch
https://github.com/openstreetmap/osm2pgsql/pull/509.diff

---
Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/509
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