[Tile-serving] [openstreetmap/osm2pgsql] document dependency on psycopg for testing (#829)

[Sarah Hoffmann]

Fixes #182.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/829

-- Commit Summary --

  * document dependency on psycopg for testing

-- File Changes --

    M CONTRIBUTING.md (8)
    M README.md (2)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/829.patch
https://github.com/openstreetmap/osm2pgsql/pull/829.diff

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