don't test for bionic #31

Job	Run time
clippy	25s
audit	13s
build-ubuntu-latest-release-default	3m 12s
rustfmt	10s
build-ubuntu-latest-release-no-default	1m 19s
check	31s
build-ubuntu-latest-debug-default	1m 11s
build-ubuntu-latest-debug-no-default	37s
build-ubuntu-20.04-release-default	2m 55s
build-ubuntu-20.04-release-no-default	1m 20s
build-ubuntu-20.04-debug-default	1m 21s
build-ubuntu-20.04-debug-no-default	39s
build-macos-latest-release-default	58s
build-macos-latest-release-no-default	1m 29s
build-macos-latest-debug-default	22s
build-macos-latest-debug-no-default	36s
clippy-upload	13s
verify all tests pass	1s
	17m 32s

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