Update README.

README.md

diff --git a/README.md b/README.md
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   * [x] BMP
   * [x] GIF
   * [x] Custom Image decoder callback(e.g. for decoding OpenEXR image)
-* Load from memory
-* Custom callback handler
-  * [x] Image load
+* Morph traget
+  * [x] Sparse accessor
+* Load glTF from memory
 * Extensions
   * [x] Draco mesh decoding