Move versioning to source.

publish.sh

@@ -1,7 +1,5 @@
 #!/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-patch.0
+source set_version.sh
+
 docker build -t revoltchat/server:${version} . &&
     docker push revoltchat/server:${version}