Tests

fix: cometbft contract #29

Job	Run time
check std	42s
clippy	1m 3s
check no-default-features	41s
check serde	44s
docs	1m 23s
fmt	7s
test stable --no-default-features	1m 0s
test stable	1m 12s
test stable --all-features	1m 41s
test beta --no-default-features	2m 27s
test beta	2m 25s
test beta --all-features	2m 37s
test nightly --no-default-features	2m 11s
test nightly	2m 18s
test nightly --all-features	2m 22s
	22m 53s

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