chore(package): update jsdom to version 15.0.0

Closes #80

Author: greenkeeper[bot]

package.json

@@ -40,7 +40,7 @@
     "eslint-plugin-jsx-a11y": "^5.1.1",
     "eslint-plugin-react": "^7.0.0",
     "file-loader": "^1.0.0-rc.0",
-    "jsdom": "^11.0.0",
+    "jsdom": "^15.0.0",
     "leaflet": "1.0.3",
     "leaflet-draw": "^0.4.9",
     "mocha": "^3.2.0",