Update package.json

Author: songyumeng

src/openlayers/package.json

@@ -21,7 +21,7 @@
  "@supermap/iclient-common": "10.0.1",
  "proj4": "2.6.0",
  "xlsx": "0.15.3",
- "canvg": "1.5.3",
+ "canvg": "3.0.2",
  "lodash.remove": "^4.7.0"
  }
 }