Updating crates.io index
 Downloading crates ...
  Downloaded lock_api v0.4.5
  Downloaded redox_syscall v0.2.10
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error: failed to parse manifest at `/build/.cargo/registry/src/github.com-1ecc6299db9ec823/coolor-0.3.1/Cargo.toml`

Caused by:
  feature `edition2021` is required

  The package requires the Cargo feature called `edition2021`, but that feature is not stabilized in this version of Cargo (1.55.0).
  Consider trying a newer version of Cargo (this may require the nightly release).
  See https://doc.rust-lang.org/nightly/cargo/reference/unstable.html#edition-2021 for more information about the status of this feature.
==> ERROR: A failure occurred in prepare().
    Aborting...