automatically commit the updated deploy date

package.json

@@ -29,7 +29,7 @@
     "clean:code": "npm-run-all prettier lint:all",
     "cname": "node tools/write-cname.js",
     "set-version": "yarn version --new-version `date -u +%Y.%m%d.%H%M`",
-    "update-deploy-date": "echo \"$(sed '$d' product-status.md)\"$'\n'\"$(jq -r '.version' package.json)\" > product-status.md",
+    "update-deploy-date": "echo \"$(sed '$d' product-status.md)\"$'\n'\"$(jq -r '.version' package.json)\" > product-status.md; git commit -m 'Update deploy date' product-status.md",
     "predeploy": "yarn run set-version; yarn run update-deploy-date; yarn run precompile; yarn run build; yarn run cname",
     "deploy": "gh-pages -d dist"
   },