chore(deps): update dependency react-dom to v16.6.3

Author: renovate-bot

package-lock.json

@@ -127,7 +127,7 @@
     "preact-compat": "3.18.4",
     "prettier": "1.15.2",
     "react": "16.5.2",
-    "react-dom": "16.6.1",
+    "react-dom": "16.6.3",
     "react-test-renderer": "16.6.1",
     "recompose": "0.30.0",
     "recursive-rename": "2.0.0",