Pin sub-dependecy of clap to be compatible with MSRV #398

Job	Run time
cargo-deny (advisories)	20s
lint	34s
cargo-deny (bans licenses sources)	17s
aarch64-apple-darwin / build	48s
aarch64-apple-darwin-nightly / build	51s
aarch64-apple-ios / build	58s
aarch64-unknown-linux-gnu / build	38s
arm-linux-androideabi / build	30s
armv7-linux-androideabi / build	35s
i686-pc-windows-gnu / build	2m 51s
i686-pc-windows-msvc / build	3m 4s
i686-unknown-linux-gnu / build	33s
aarch64-unknown-linux-musl / build	52s
i686-unknown-linux-musl / build	1m 0s
msrv-aarch64-apple-darwin / build	1m 2s
msrv-arm-linux-androideabi / build	1m 2s
msrv-x86_64-pc-windows-msvc / build	2m 5s
msrv-x86_64-unknown-linux-gnu / build	57s
msrv-x86_64-unknown-freebsd / build	1m 0s
msrv-x86_64-unknown-netbsd / build	1m 11s
msrv-x86_64-unknown-linux-musl / build	1m 7s
x86_64-apple-darwin / build	33s
x86_64-pc-windows-gnu / build	2m 34s
x86_64-pc-windows-msvc / build	2m 25s
x86_64-pc-windows-msvc-nightly / build	2m 11s
x86_64-unknown-freebsd / build	18s
x86_64-unknown-linux-gnu / build	48s
x86_64-unknown-linux-musl / build	45s
x86_64-unknown-linux-gnu-nightly / build	52s
x86_64-unknown-netbsd / build	25s
	33m 6s

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