Add event when user goes offline.

publish.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+# Tip: for subsequent builds, don't update Cargo.toml
+# in order to not download all the crates again.
+# Update Cargo.toml on major release.
+version=0.4.1-alpha.4
+docker build -t revoltchat/server:${version} . &&
+    docker push revoltchat/server:${version}