build

Increment version to 0.20.0-dev #915

Job	Run time
build_and_test_macos (macos-13)	1m 56s
build_and_test (stable, --features "")	1m 55s
build_and_test_macos (macos-latest)	1m 37s
build_and_test (stable, --all-features)	1m 54s
build_and_test_windows	1m 41s
fmt	35s
build_and_test (stable, --no-default-features)	1m 54s
minimal-versions	1m 55s
build_and_test (1.82, --features "")	1m 55s
semver	1m 41s
build_and_test (1.82, --all-features)	1m 55s
codecov	1m 55s
build_and_test (1.82, --no-default-features)	1m 52s
build_and_test (beta, --features "")	1m 38s
clippy	1m 23s
build_and_test (beta, --all-features)	1m 54s
build_and_test (beta, --no-default-features)	1m 29s
build_and_test (nightly, --features "")	1m 55s
build_and_test (nightly, --all-features)	1m 47s
build_and_test (nightly, --no-default-features)	1m 53s
	34m 44s

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