Fix test build after recent changes - minor.

CryptoSwiftTests/HashTests.swift

@@ -26,7 +26,7 @@ final class CryptoSwiftTests: XCTestCase {
 
     func testMD5_emptyString() {
         let data:Data = "".data(using: String.Encoding.utf8, allowLossyConversion: false)!
-        XCTAssertEqual(Hash.md5(data.arrayOfBytes()).calculate(), [0xd4,0x1d,0x8c,0xd9,0x8f,0x00,0xb2,0x04,0xe9,0x80,0x09,0x98,0xec,0xf8,0x42,0x7e], "MD5 calculation failed")
+        XCTAssertEqual(Hash.md5(data.bytes).calculate(), [0xd4,0x1d,0x8c,0xd9,0x8f,0x00,0xb2,0x04,0xe9,0x80,0x09,0x98,0xec,0xf8,0x42,0x7e], "MD5 calculation failed")
     }
 
     func testMD5_string() {