Support running assignment rules (#243)

Author: thewheat

README.md

@@ -585,6 +585,9 @@ userReply.setAttachmentUrls(new String[]{"http://www.example.com/attachment.jpg"
 System.out.println(MapperSupport.objectMapper().writeValueAsString(userReply));
 Conversation.reply("66", userReply);
 
+// run assignment rules
+Conversation.runAssignmentRules("19240007891");
+
 // mark conversation as read
 Conversation.markAsRead("66");
 ```

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

@@ -134,6 +134,11 @@ public static AdminMessage create(AdminMessage message) throws InvalidException
         return response;
     }
 
+    public static Conversation runAssignmentRules(String id) {
+        final HttpClient resource = new HttpClient(UriBuilder.newBuilder().path("conversations").path(id).path("run_assignment_rules").build());
+        return resource.post(Conversation.class, null);
+    }
+
     static void validateAdminReplyRequest(AdminReply reply) {
 
         validateMessageType(reply);