Update changelog regarding initialization during vocabulary update
@@ -47,6 +47,7 @@ This version also changes the public API scope of the project:
* Log level configuration also controls TensorFlow C++ logs
* All public classes and functions are now properly accessible from the root package `opennmt`
* Fix dtype error after updating the vocabulary of an averaged checkpoint
+* When updating vocabularies, weights of new words are randomly initialized instead of a zero initialized
### Missing features
