0.6.16

• Add --with-pwsh-env-prefix to cargo llvm-cov show-env subcommand. (#411, thanks @LittleBoxOfSunshine)

• Document usage with GitLab CI. (#405, thanks @jaskij)

• Document usage with afl.rs. (#369, thanks @njelich)

• Update ruzstd to 0.8.

  This increases the rustc version required to build cargo-llvm-cov. (rustc 1.73+ -> 1.81+)
  The cargo/rustc version required to run cargo-llvm-cov remains unchanged.