Update steps for 'Using your own OSM data' (#889)

Add more clear step into quickstart.md for using own OSM data
fix #843

QUICKSTART.md

@@ -363,11 +363,11 @@ This is generating `.mbtiles` for your area :  [ MIN_ZOOM: "0"  - MAX_ZOOM: "7"
 ./quickstart.sh yukon                        # Yukon, Canada
 ```
 ### Using your own OSM data
-Mbtiles can be generated from an arbitrary osm.pbf (e.g. for a region that is not covered by an existing extract) by making the `data/` directory and placing an osm.pbf inside/
+Mbtiles can be generated from an arbitrary osm.pbf (e.g. for a region that is not covered by an existing extract) by making the `data/` directory and placing an *-latest.osm.pbf inside. Inside of folder have to be `docker-compose-config.yml` file too, otherwize whole folder `data/` will be deleted and `download-osm` will try to download osm.pbf file from `geofabric`, `osmfr` or `bbbike`.
 
 ```
 mkdir -p data
-mv my.osm.pbf data/
+mv my-latest.osm.pbf data/
 ./quickstart.sh my
 ```