Increase coverage for Send methods

Author: pengrad

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

@@ -48,7 +48,7 @@ public PhotoSize thumbnail() {
      */
     @Deprecated 
     public PhotoSize thumb() {
-        return thumbnail;
+        return thumbnail();
     }
 
     public String fileName() {

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

@@ -62,7 +62,7 @@ public PhotoSize thumbnail() {
      */
     @Deprecated 
     public PhotoSize thumb() {
-        return thumbnail;
+        return thumbnail();
     }
 
     @Override

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

@@ -34,7 +34,7 @@ public PhotoSize thumbnail() {
      */
     @Deprecated 
     public PhotoSize thumb() {
-        return thumbnail;
+        return thumbnail();
     }
 
     public String fileName() {

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

@@ -75,7 +75,7 @@ public PhotoSize thumbnail() {
      */
     @Deprecated 
     public PhotoSize thumb() {
-        return thumbnail;
+        return thumbnail();
     }
 
     public String emoji() {

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

@@ -21,7 +21,7 @@ public class StickerSet implements Serializable {
     private Boolean contains_masks;
     private Sticker[] stickers;
     private PhotoSize thumbnail;
-  
+
 
     public String name() {
         return name;
@@ -39,9 +39,9 @@ public Boolean isAnimated() {
         return is_animated;
     }
 
-    /** 
-     *  @deprecated Use type() and check if it equals to Type.mask
-     */   
+    /**
+     * @deprecated Use type() and check if it equals to Type.mask
+     */
     @Deprecated
     public Boolean containsMasks() {
         return contains_masks;
@@ -58,9 +58,9 @@ public PhotoSize thumbnail() {
     /**
      * @deprecated Use thumbnail instead
      */
-    @Deprecated 
+    @Deprecated
     public PhotoSize thumb() {
-        return thumbnail;
+        return thumbnail();
     }
 
     public Boolean isVideo() {

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

@@ -50,7 +50,7 @@ public PhotoSize thumbnail() {
      */
     @Deprecated 
     public PhotoSize thumb() {
-        return thumbnail;
+        return thumbnail();
     }
 
     public String fileName() {

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

@@ -42,7 +42,7 @@ public PhotoSize thumbnail() {
      */
     @Deprecated 
     public PhotoSize thumb() {
-        return thumbnail;
+        return thumbnail();
     }
 
     public Long fileSize() {

library/src/main/java/com/pengrad/telegrambot/request/SendAnimation.java

@@ -40,15 +40,15 @@ public SendAnimation height(int height) {
      */
     @Deprecated 
     public SendAnimation thumb(byte[] thumb) {
-        return super.thumbnail(thumb);
+        return thumbnail(thumb);
     }
 
     /**
      * @deprecated Use thumbnail instead
      */
     @Deprecated 
     public SendAnimation thumb(File thumb) {
-        return super.thumbnail(thumb);
+        return thumbnail(thumb);
     }
 
     public SendAnimation thumbnail(byte[] thumbnail) {

library/src/main/java/com/pengrad/telegrambot/request/SendAudio.java

@@ -52,15 +52,15 @@ public SendAudio title(String title) {
      */
     @Deprecated 
     public SendAudio thumb(byte[] thumb) {
-        return super.thumbnail(thumb);
+        return thumbnail(thumb);
     }
 
     /**
      * @deprecated Use thumbnail instead
      */
     @Deprecated 
     public SendAudio thumb(File thumb) {
-        return super.thumbnail(thumb);
+        return thumbnail(thumb);
     }
 
     public SendAudio thumbnail(byte[] thumbnail) {

library/src/main/java/com/pengrad/telegrambot/request/SendDocument.java

@@ -28,15 +28,15 @@ public SendDocument(Object chatId, byte[] document) {
      */
     @Deprecated 
     public SendDocument thumb(byte[] thumb) {
-        return super.thumbnail(thumb);
+        return thumbnail(thumb);
     }
 
     /**
      * @deprecated Use thumbnail instead
      */
     @Deprecated 
     public SendDocument thumb(File thumb) {
-        return super.thumbnail(thumb);
+        return thumbnail(thumb);
     }
 
     public SendDocument thumbnail(byte[] thumbnail) {

library/src/main/java/com/pengrad/telegrambot/request/SendVideo.java

@@ -38,17 +38,17 @@ public SendVideo height(int height) {
     /**
      * @deprecated Use thumbnail instead
      */
-    @Deprecated 
+    @Deprecated
     public SendVideo thumb(byte[] thumb) {
-        return super.thumbnail(thumb);
+        return thumbnail(thumb);
     }
 
     /**
      * @deprecated Use thumbnail instead
      */
-    @Deprecated 
+    @Deprecated
     public SendVideo thumb(File thumb) {
-        return super.thumbnail(thumb);
+        return thumbnail(thumb);
     }
 
     public SendVideo thumbnail(byte[] thumbnail) {

library/src/main/java/com/pengrad/telegrambot/request/SendVideoNote.java

@@ -33,15 +33,15 @@ public SendVideoNote length(int length) {
      */
     @Deprecated 
     public SendVideoNote thumb(byte[] thumb) {
-        return super.thumbnail(thumb);
+        return thumbnail(thumb);
     }
 
     /**
      * @deprecated Use thumbnail instead
      */
     @Deprecated 
     public SendVideoNote thumb(File thumb) {
-        return super.thumbnail(thumb);
+        return thumbnail(thumb);
     }
 
     public SendVideoNote thumbnail(byte[] thumbnail) {