Merge pull request #98 from shellrow/feat-add-mtu #142

Job	Run time
Rustfmt	5s
Check (macOS-latest)	12s
Check (ubuntu-latest)	11s
Check (windows-latest)	1m 45s
Cross compile (x86_64-unknown-freebsd)	32s
Cross compile (armv7-linux-androideabi)	43s
Cross compile (i686-unknown-linux-musl)	29s
Cross compile (x86_64-unknown-netbsd)	26s
Cross compile (x86_64-unknown-linux-musl)	31s
Cross compile (aarch64-linux-android)	42s
	5m 36s

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