aya-template/xtask
Michal Rostecki 9297249e01 xtask: Use clap instead of structopt
structopt was merged into clap (starting from clap 3.0), therefore
becoming a deprecated project.

Signed-off-by: Michal Rostecki <vadorovsky@gmail.com>
..
src xtask: Use clap instead of structopt
Cargo.toml xtask: Use clap instead of structopt