Minor update of README. Byte->Uint8

README.md

@@ -82,7 +82,7 @@ Generally you should use `CryptoSwift.Hash`, `CryptoSwift.Cipher` enums or conve
 Hash enum usage
 ```swift
 /* Hash enum usage */
-var data:NSData = NSData(bytes: [49, 50, 51] as [Byte], length: 3)
+var data:NSData = NSData(bytes: [49, 50, 51] as [UInt8], length: 3)
 if let data = CryptoSwift.Hash.md5(data).calculate() {
     println(data.hexString)
 }