增加获取SignatureResult成员方法 (#119)

Author: lianup

src/main/java/com/wechat/pay/contrib/apache/httpclient/auth/Signer.java

@@ -12,6 +12,14 @@ class SignatureResult {
         protected final String sign;
         protected final String certificateSerialNumber;
 
+        public String getSign() {
+            return sign;
+        }
+
+        public String getCertificateSerialNumber() {
+            return certificateSerialNumber;
+        }
+
         public SignatureResult(String sign, String serialNumber) {
             this.sign = sign;
             this.certificateSerialNumber = serialNumber;