[Tile-serving] [openstreetmap/osm2pgsql] How to update version 4.x database? (#762)

[Klaus Tockloth]

These are my (planned) instructions to initial import osm data into a new version 4 database:
```
psql -d gis -c 'CREATE EXTENSION postgis; CREATE EXTENSION hstore;'
osm2pgsql --username postgres --multi-geometry --hstore --slim --create --cache 32000 --number-processes 8 --database gis --style openstreetmap-carto.style --tag-transform-script openstreetmap-carto.lua dach-latest.osm.pbf
psql -d gis -f indexes.sql
```

But how to update the database? Something similar to the initial import?
```
osmosis --rri workingDirectory=./ --simplify-change --write-xml-change ./changes.osc.gz
osm2pgsql --username postgres --multi-geometry --hstore --slim --append --cache 32000 --number-processes 8 --database gis --style openstreetmap-carto.style --tag-transform-script openstreetmap-carto.lua changes.osc.gz
```
Klaus

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