remove deny lints

[burrbull]

closes #763

[burrbull]

cc @Emilgardis what this error could mean?

ci/script.sh: line 66: RUST_TOOLCHAIN: unbound variable

[thejpster]

I think it means that bash variable didn't have a value. It's on the line where you check if it's a nightly Rust version. But you also set the variable in CI before you call the script, so I'm confused?

[Emilgardis]

the error is due to set -u, an easy fix is to use "${RUST_TOOLCHAIN:-}"