Fix ChatShared and UserShared getter modifiers private->public

Author: Vitaliy Sirotkin

library/src/main/java/com/pengrad/telegrambot/model/ChatShared.java

@@ -9,11 +9,11 @@ public class ChatShared implements Serializable {
     private Integer request_id;
     private Long chat_id;
 
-    private Integer requestId() {
+    public Integer requestId() {
         return request_id;
     }
 
-    private Long chatId() {
+    public Long chatId() {
         return chat_id;
     }
 

library/src/main/java/com/pengrad/telegrambot/model/UserShared.java

@@ -9,11 +9,11 @@ public class UserShared implements Serializable {
     private Integer request_id;
     private Long user_id;
 
-    private Integer requestId() {
+    public Integer requestId() {
         return request_id;
     }
 
-    private Long userId() {
+    public Long userId() {
         return user_id;
     }