Merge pull request #76 from peter-cudmore/SerialFramed-export-fix #119

Job	Run time
cargo-fmt (stable, ubuntu-latest)	2m 20s
cargo-test-linux (stable)	1m 23s
cargo-fmt (stable, windows-latest)	2m 48s
cargo-clippy (stable, ubuntu-latest)	1m 36s
cargo-test-linux (beta)	1m 25s
cargo-clippy (stable, windows-latest)	1m 31s
cargo-test-macOS (stable)	13s
cargo-test-linux (1.46.0)	1m 21s
cargo-test-macOS (beta)	11s
cargo-test-windows (stable)	40s
cargo-test-windows (beta)	41s
cargo-test-windows (1.46.0)	44s
cargo-test-macOS (1.46.0)	9s
	15m 2s

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