tax_free 옵션 적용

Author: rupy1014

bootpay/src/main/java/kr/co/bootpay/BootpayWebView.java

@@ -102,6 +102,7 @@ private void goBootpayRequest() {
         loadParams(
                 request(
                         price(),
+                        taxFree(),
                         easyPayUserToken(),
                         applicationId(),
                         name(),
@@ -382,6 +383,10 @@ private String price() {
         return "price:" + request.getPrice();
     }
 
+    private String taxFree() {
+        return "tax_free:" + request.getTaxFree();
+    }
+
     private String easyPayUserToken() {
         if(request.getEasyPayUserToken() == null || "null".equals(request.getEasyPayUserToken())) return "";
         return String.format(Locale.KOREA, "user_token:'%s'", request.getEasyPayUserToken());