panics on SIGPIPE

[felinira]

Describe the bug
When encountering SIGPIPE, the program panics. This is almost never correct, but default rust behaviour:

rust-lang/rust#46016
rust-lang/rust#62569

To Reproduce

# cargo about generate --format json | head -n0
thread 'main' panicked at library/std/src/io/stdio.rs:1118:9:
failed printing to stdout: Broken pipe (os error 32)

Expected behavior
cargo about should not panic. Instead it should handle SIGPIPE and exit with exit code 141. See https://github.com/kurtbuilds/sigpipe for an example on how to solve this.

Device:

• OS: any unix
• Version 0.6.2