chore: bump version to 0.1.20 in Cargo.toml #28

Job	Run time
test	5m 30s
release (windows-latest, windows, just exe, dist/*.zip)	25m 52s
release (macos-latest, macos, just dmg, dist/*.dmg)	11m 4s
release (ubuntu-latest, linux, just tgz, dist/*.tar.gz)	5m 29s
	47m 55s

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