add attachments to admin and user reply

Author: mmartinic

README.md

@@ -447,6 +447,7 @@ ConversationCollection openForAdmin = Conversation.list(params);
 Admin admin = new Admin().setId("1");
 AdminReply adminReply = new AdminReply(admin);
 adminReply.setBody("These apples are healthsome");
+adminReply.setAttachmentUrls(new String[]{"http://www.example.com/attachment.jpg"}); // optional - list of attachments
 Conversation.reply("66", adminReply);
 
 // admin close
@@ -459,6 +460,7 @@ Conversation.reply("66", adminReply);
 User user1 = new User().setId("5310d8e8598c9a0b24000005");
 UserReply userReply = new UserReply(user1);
 userReply.setBody("Mighty fine shindig");
+userReply.setAttachmentUrls(new String[]{"http://www.example.com/attachment.jpg"}); // optional - list of attachments
 System.out.println(MapperSupport.objectMapper().writeValueAsString(userReply));
 Conversation.reply("66", userReply);
 ```

intercom-java/src/main/java/io/intercom/api/AdminReply.java

@@ -46,6 +46,11 @@ public String getAdminID() {
         public String getAssigneeID() {
             return reply.getAssigneeID();
         }
+
+        @JsonProperty("attachment_urls")
+        private String[] getAttachmentUrls() {
+            return reply.getAttachmentUrls();
+        }
     }
 
     @JsonProperty("assignee_id")

intercom-java/src/main/java/io/intercom/api/Reply.java

@@ -32,7 +32,11 @@ public Reply<T> setBody(String body) {
         this.body = body;
         return this;
     }
-    
+
+    public String[] getAttachmentUrls() {
+        return attachmentUrls;
+    }
+
     public Reply<T> setAttachmentUrls(String[] attachmentUrls) {
     	this.attachmentUrls = attachmentUrls;
     	return this;

intercom-java/src/main/java/io/intercom/api/UserReply.java

@@ -51,6 +51,11 @@ public String getUserID() {
         public String getEmail() {
             return reply.getFrom().getEmail();
         }
+
+        @JsonProperty("attachment_urls")
+        private String[] getAttachmentUrls() {
+            return reply.getAttachmentUrls();
+        }
     }
 
     public UserReply(User user) {