Move attribution to the class implementation

Signed-off-by: martinRenou <[email protected]>

Author: martinRenou

examples/VectorTiles.ipynb

@@ -19,8 +19,7 @@
     "\n",
     "# This is a custom VectorTileLayer subclass, allowing to pass our api key to the url\n",
     "class CustomVectorTileLayer(VectorTileLayer):\n",
-    "    api_key = Unicode('gCZXZglvRQa6sB2z7JzL1w').tag(sync=True, o=True)\n",
-    "    attribution = Unicode('<a href=\"https://nextzen.com/\">&copy; NextZen</a>, <a href=\"http://www.openstreetmap.org/copyright\">&copy; OpenStreetMap</a> contributors').tag(sync=True, o=True)"
+    "    api_key = Unicode('gCZXZglvRQa6sB2z7JzL1w').tag(sync=True, o=True)"
    ]
   },
   {

ipyleaflet/leaflet.py

@@ -393,6 +393,8 @@ class VectorTileLayer(Layer):
     _model_name = Unicode('LeafletVectorTileLayerModel').tag(sync=True)
 
     url = Unicode().tag(sync=True, o=True)
+    attribution = Unicode().tag(sync=True, o=True)
+
     vector_tile_layer_styles = Dict().tag(sync=True, o=True)
 
     def __init__(self, **kwargs):