scatter: add marker.color to hovertemplate available variables

Author: antoinerg

src/traces/scatter/attributes.js

@@ -205,7 +205,7 @@ module.exports = {
         ].join(' ')
     },
     hovertemplate: hovertemplateAttrs({}, {
-        keys: ['marker.size']
+        keys: ['marker.size', 'marker.color']
     }),
     line: {
         color: {

test/jasmine/tests/scatter_test.js

@@ -1811,6 +1811,6 @@ describe('Test scatter *clipnaxis*:', function() {
 });
 
 describe('event data', function() {
-    var mock = require('@mocks/12');
-    checkEventData(mock, 130, 350, ['marker.size']);
+    var mock = require('@mocks/scatter-colorscale-colorbar');
+    checkEventData(mock, 540, 260, ['marker.size', 'marker.color']);
 });