Remove pk from Caption constructor, to resolve deserialization exception when pk sent by api is a string

app/src/main/java/awais/instagrabber/repositories/responses/Caption.kt

@@ -2,4 +2,6 @@ package awais.instagrabber.repositories.responses
 
 import java.io.Serializable
 
-data class Caption(var pk: Long = 0, val userId: Long, var text: String) : Serializable
+data class Caption(val userId: Long, var text: String?) : Serializable {
+    var pk: Long = 0
+}

app/src/main/java/awais/instagrabber/utils/ResponseBodyUtils.java

@@ -781,7 +781,6 @@ public final class ResponseBodyUtils {
             );
         }
         final Caption caption = new Caption(
-                0,
                 userId,
                 captionText != null ? captionText : ""
         );