Tests

refactor(primitives): improve readability of Env.validate_tx() (#924) #1

Job	Run time
check no-default-features	25s
check serde	18s
test stable --no-default-features	1m 59s
test no_std	27s
test stable	2m 2s
check std	23s
test stable --all-features	1m 59s
test beta --no-default-features	2m 0s
clippy	1m 12s
test beta	1m 53s
fmt	13s
test beta --all-features	1m 57s
test nightly --no-default-features	1m 59s
test nightly	1m 58s
test nightly --all-features	1m 57s
docs	1m 11s
	21m 53s

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