* feat: simple version switch
* chore: remove debug print
* chore: add common folder
* tests: add drop table
* feat: pull versioned binary
* chore: don't use native-tls
* chore: rm outdated docs
* chore: new line
* fix: save old bin dir
* fix: switch version restart all node
* feat: use etcd
* fix: wait for election
* fix: normal sqlness
* refactor: hashmap for bin dir
* test: past 3 major version compat crate table
* refactor: allow using without setup etcd
