feat: add update notifier

Author: edosrecki

.releaserc.json

@@ -4,14 +4,14 @@
     "@semantic-release/commit-analyzer",
     "@semantic-release/release-notes-generator",
     "@semantic-release/changelog",
-    "@semantic-release/npm",
     "@semantic-release/git",
     [
       "@semantic-release/exec",
       {
         "publishCmd": "./tools/package-google-cloud-sql.sh ${nextRelease.version}"
       }
     ],
+    "@semantic-release/npm",
     [
       "@semantic-release/github",
       {

README.adoc

@@ -101,5 +101,4 @@ To deploy a new version of `google-cloud-sql` app, manually run a https://github
 == Todo
 * Add snap for Linux
 * Add completions
-* https://www.npmjs.com/package/update-notifier[Notify user] when new version of the app is available
 * Cache user's running pods, and alert user on next startup if they were not cleaned up on previous app exit.