fix(package): update react-dom to version 16.9.0

Closes #14

Author: greenkeeper[bot]

package.json

@@ -40,7 +40,7 @@
   },
   "dependencies": {
     "react": "16.9.0",
-    "react-dom": "16.3.0"
+    "react-dom": "16.9.0"
   },
   "devDependencies": {
     "@commitlint/cli": "6.1.3",