message: Avoid manual step in cargo release process.
diff: @@ -148,8 +148,7 @@ Decide on a time to do the release, T.
  # Publish to crates.io. This will publish internal dependencies first (if
  # necessary), then publish Cargo itself.
  ./publish.py
  - # Where YY is the Rust minor release, add one to it (Rust 1.49.0 = Cargo 0.50.0).
  - CARGO_VERSION="0.YY+1.0"
  + CARGO_VERSION=$(cargo read-manifest | jq -r .version)
  git tag -u FA1BE5FE $CARGO_VERSION
  git push git@github.com:rust-lang/cargo.git $CARGO_VERSION
  ```
  