fix fermi height (#78)

Author: yoshidan

module/fork_spec.go

@@ -106,8 +106,9 @@ func GetForkParameters(network Network) []*ForkSpec {
 		// https://bscscan.com/block/52337091
 		// https://github.com/bnb-chain/bsc/releases/tag/v1.5.16
 		hardForks[indexMaxwellHF].HeightOrTimestamp = &ForkSpec_Height{Height: 52337091}
-		// https://github.com/bnb-chain/bsc/pull/3466/files
-		hardForks[indexFermiHF].HeightOrTimestamp = &ForkSpec_Timestamp{Timestamp: 1768357800 * 1000}
+		// https://bscscan.com/block/75140593
+		// https://github.com/bnb-chain/bsc/releases/tag/v1.6.4
+		hardForks[indexFermiHF].HeightOrTimestamp = &ForkSpec_Height{Height: 75140593}
 		return hardForks
 	}
 	return nil