https://toml.io/en/v1.1.0#inline-table
#TOML has officially become the best configuration format, with support for multi-line inline tables in v1.1.0. I want it to be supported in cargo ASAP so that we can get rid of the super long lines for dependencies.
Update: TOML 1.1.0 support in Rust has been released in sync with the spec release. I'm going to try it out: https://crates.io/crates/toml