chore(package): update jsdom to version 15.2.0

Closes #11

Author: greenkeeper[bot]

package.json

@@ -45,7 +45,7 @@
     "express": "4.15.2",
     "extract-text-webpack-plugin": "^2.1.0",
     "html-webpack-plugin": "^2.28.0",
-    "jsdom": "^10.0.0",
+    "jsdom": "^15.2.0",
     "json-schema-faker": "^0.4.1",
     "json-server": "^0.10.0",
     "localtunnel": "^1.8.2",