Fix object call which no longer tolerates other fields

Author: ianopolous

src/main/java/io/ipfs/api/MerkleNode.java

@@ -87,16 +87,8 @@ public static MerkleNode fromJSON(Object rawjson) {
 
     public Object toJSON() {
         Map<String, Object> res = new TreeMap<>();
-        res.put("Hash", hash);
         res.put("Links", links.stream().map(x -> x.hash).collect(Collectors.toList()));
         data.ifPresent(bytes -> res.put("Data", bytes));
-        name.ifPresent(s -> res.put("Name", s));
-        if (size.isPresent()) {
-            res.put("Size", size.get());
-        } else {
-            largeSize.ifPresent(s -> res.put("Size", s));
-        }
-        type.ifPresent(integer -> res.put("Type", integer));
         return res;
     }