Code Correctness: Byte Array to String Conversion

[QiAnXinCodeSafe]

amazon-pay-sdk-java/src/com/amazon/pay/impl/Util.java

Line 191 in 9b0bf0f

headerMap.put("Proxy-Authorization", new String(encodedPassword));

Converting a byte array into a String may lead to data loss.

[OBrutus]

Let me try this.