feat: add bohr hardfork for bsc (#49) #116

Job	Run time
check	1m 10s
check serde	1m 13s
docs / optimism	1m 49s
docs / bsc	1m 43s
check std	1m 9s
clippy / optimism	1m 51s
clippy / bsc	1m 49s
fmt	13s
test stable --no-default-features	3m 17s
test stable	3m 16s
test stable --features bsc	3m 23s
test stable --features optimism,opbnb	3m 27s
test beta --no-default-features	3m 4s
test beta	3m 15s
test beta --features bsc	3m 21s
test beta --features optimism,opbnb	3m 21s
test nightly --no-default-features	2m 54s
test nightly	2m 54s
test nightly --features bsc	3m 2s
test nightly --features optimism,opbnb	2m 59s
	49m 10s

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