Add landuse=salt_pond as water (#1000)

Add salt pond as water. Most of salt pond are already tagged with natural=water even if it's not required. So the load added by this tag is very light.
2020-09-29 06:53:35 +02:00 · 2020-09-29 06:53:35 +02:00 · a3ce04fe23
commit a3ce04fe23
--- a/layers/water/mapping.yaml
+++ b/layers/water/mapping.yaml
@ -88,6 +88,7 @@ tables:
      landuse:
      - reservoir
      - basin
+      - salt_pond
      leisure:
      - swimming_pool
      natural:
--- a/layers/water/mapping_diagram.png
+++ b/layers/water/mapping_diagram.png
--- a/layers/water_name/mapping_diagram.png
+++ b/layers/water_name/mapping_diagram.png