Use Heroku RUST_VERSION config instead of Cargo.toml config
Use Heroku RUST_VERSION config instead of Cargo.toml config

malept/hasbuildpackbundlerupgradedyet,malept/hasbuildpackbundlerupgradedyet,malept/hasbuildpackbundlerupgradedyet,malept/hasbuildpackbundlerupgradedyet,malept/hasbuildpackbundlerupgradedyet