Set DTR by default when opening a serial port #528

Job	Run time
cargo-deny (advisories)	15s
lint	21s
cargo-deny (bans licenses sources)	16s
aarch64-apple-darwin / build	26s
aarch64-apple-ios / build	22s
aarch64-unknown-linux-gnu / build	33s
aarch64-unknown-linux-musl / build	57s
arm-linux-androideabi / build	33s
armv7-linux-androideabi / build	22s
aarch64-apple-darwin-nightly / build	52s
i686-pc-windows-gnu / build	55s
i686-pc-windows-msvc / build	2m 7s
i686-unknown-linux-gnu / build	29s
msrv-aarch64-apple-darwin / build	59s
i686-unknown-linux-musl / build	53s
msrv-arm-linux-androideabi / build	53s
msrv-x86_64-pc-windows-msvc / build	36s
msrv-x86_64-unknown-freebsd / build	49s
msrv-x86_64-unknown-linux-gnu / build	25s
msrv-x86_64-unknown-linux-musl / build	45s
msrv-x86_64-unknown-netbsd / build	44s
x86_64-apple-darwin / build	37s
x86_64-pc-windows-gnu / build	2m 48s
x86_64-pc-windows-msvc / build	2m 29s
x86_64-pc-windows-msvc-nightly / build	2m 1s
x86_64-unknown-freebsd / build	21s
x86_64-unknown-linux-gnu / build	1m 3s
x86_64-unknown-linux-gnu-nightly / build	1m 3s
x86_64-unknown-linux-musl / build	53s
x86_64-unknown-netbsd / build	20s
	26m 7s

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