Add common interface to VideoVersionsMeta and ImageVersionsMeta

src/main/java/com/github/instagram4j/instagram4j/models/media/ImageVersionsMeta.java

@@ -3,7 +3,7 @@
 import lombok.Data;
 
 @Data
-public class ImageVersionsMeta {
+public class ImageVersionsMeta implements Rectangle {
     private String url;
     private int width;
     private int height;

src/main/java/com/github/instagram4j/instagram4j/models/media/Rectangle.java

@@ -0,0 +1,7 @@
+package com.github.instagram4j.instagram4j.models.media;
+
+public interface Rectangle {
+    int getWidth();
+    int getHeight();
+    String getUrl();
+}

src/main/java/com/github/instagram4j/instagram4j/models/media/VideoVersionsMeta.java

@@ -3,7 +3,7 @@
 import lombok.Data;
 
 @Data
-public class VideoVersionsMeta {
+public class VideoVersionsMeta implements Rectangle {
     private int height;
     private int width;
     private String id;