chore: update changelog

Author: christinestraub

CHANGELOG.md

@@ -1,3 +1,11 @@
+## 0.16.4-dev0
+
+### Enhancements
+
+### Features
+
+### Fixes
+
 ## 0.16.3
 
 ### Enhancements
@@ -10,7 +18,6 @@
 * **Fix missing elements when layout element parsed in V2 ontology**
 * updated **unstructured-inference** to be **0.8.1** in requirements/extra-pdf-image.in
 
-
 ## 0.16.2
 
 ### Enhancements