Whitelist highway=slipway+leisure=slipway conflict (#1454)

Author: emersonveenstra

plugins/TagRemove_Incompatibles.py

@@ -73,6 +73,7 @@ def init(self, logger):
                 ['footway', 'railway', 'disused'],
                 ['path', 'railway', 'disused'],
                 ['service', 'amenity', 'weighbridge'],
+                ['service', 'leisure', 'slipway'],
             ],
             'natural': [
                 ['water', 'leisure', 'marina'],