Merge pull request #91 from fridzema/patch-1

doc fix.

docs/index.html

@@ -251,7 +251,7 @@
     height: 115,
     data: heatmap_data,  // object with date/timestamp-value pairs
 
-    discrete_domains: 1  // default: 0
+    discrete_domains: 1,  // default: 0
 
     start: start_date,
                   // A Date object;