fix(package): update react-dom to version 16.3.2

Closes #39

Author: greenkeeper[bot]

package.json

@@ -84,7 +84,7 @@
     "object.assign": "^4.0.3",
     "radium": "^0.18.1",
     "react": "^15.4.1",
-    "react-dom": "^15.4.1",
+    "react-dom": "^16.3.2",
     "react-intl": "^2.1.2",
     "react-redux": "^5.0.1",
     "react-router": "^3.0.0",