Fix error in pull requests

Merge #36

src/main/java/org/telegram/telegrambots/api/objects/Sticker.java

@@ -51,7 +51,7 @@ public class Sticker implements IBotApiObject {
         }
     }
 
-        public String getFileId() {
+    public String getFileId() {
         return fileId;
     }
 
@@ -63,7 +63,7 @@ public class Sticker implements IBotApiObject {
         return height;
     }
 
-    public String getThumb() {
+    public PhotoSize getThumb() {
         return thumb;
     }