[Geocoding] Nominatim 3.4.0 released

[Sarah Hoffmann]

Hi,

we are happy to announce a new release 3.4.0 of Nominatim.

This release brings some improvements to the internal database structure
that further reduce the size of the database. It also contains a fix for
osm2pgsql where the import sometimes runs out of memory, especially when
no flatnode files are used. If you plan to import a new database without
flatnode files, an upgrade is strongly recommended.

As usual, there are some smaller improvements to documentation and the
search algorithm. Details can be found in Changelog.md.

Please note that starting with this vesion PostgreSQL >= 9.3,
PostGIS >= 2.2 and PHP >= 7.0 are required.

If you want to update from 3.x.x, there is a database migration path
described in the migration guide. Migrating from 3.1.0 can be done without
problems. When updating from 3.0.x, a full database reimport is strongly
recommended. Updating from older releases is only possible with a database
reimport.

Many thanks to everybody who has contributed small and large patches.

Kind regards

Sarah