README + formatting + argument checking

Dependencies

• [2] NPSWSVZN Init

Change contents

• replacement in src/main.rs at line 34
  [2.966]→[2.966:1122](∅→∅)
  − .arg(clap::Arg::with_name("port").long("port").takes_value(true))

  − .arg(clap::Arg::with_name("password").long("password").takes_value(true))
  [2.966]

  [2.1122]
  + .arg(

  + clap::Arg::with_name("port")

  + .long("port")

  + .required(true)

  + .takes_value(true),

  + )

  + .arg(

  + clap::Arg::with_name("password")

  + .long("password")

  + .required(true)

  + .takes_value(true),

  + )
• edit in README.md at line 4
  [2.7321]
  +

  + ### The problem this solves

  +

  + PostgreSQL has multiple ways to operate in a "leader-replicae" mode. However, failover isn't automatic, and requires another protocol to decide which of the replicae becomes the leader when the previous leader fails.

  +

  + This crate solves this problem, in the particular configuration where one has an Etcd v3 server running, for example because of requirements from another server running on the same service.