chore(package): update nwb to version 0.24.6

Closes #31

Author: greenkeeper[bot]

package.json

@@ -26,7 +26,7 @@
     "gh-pages": "^2.0.0",
     "lodash.random": "^3.2.0",
     "lodash.range": "^3.2.0",
-    "nwb": "~0.23.0",
+    "nwb": "~0.24.6",
     "prop-types": "^15.5.10",
     "react": "^16.2.0",
     "react-dom": "^16.2.0",