Update Clap to avoid future incompatibility warning #2
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Ping from rust-lang/rust :-)
rustc has a bug in macro parsing for quite a while, where it didn't flag some erroneous macro definitions as such.
This was a deny-by-default lint for some time, and in rust-lang/rust#75516 we want to turn it into a hard error.
Clap 2.9 is one of the affected crates.
This PR just updates clap to keep this crate compiling with Cargo.lock.