Update package.json

Author: songyumeng

src/leaflet/package.json

@@ -23,6 +23,6 @@
  "jsonsql": "0.2.5",
  "pbf": "3.2.1",
  "proj4": "2.6.0",
- "xlsx": "0.15.3"
+ "xlsx": "0.15.4"
  }
 }