Add changelog

Author: rlazo

firebase-vertexai/CHANGELOG.md

@@ -2,6 +2,7 @@
 * [fixed] Improved error message when using an invalid location. (#6428)
 * [fixed] Fixed issue where Firebase App Check error tokens were unintentionally missing from the requests. (#6409)
 * [fixed] Clarified in the documentation that `Schema.integer` and `Schema.float` only provide hints to the model. (#6420)
+* [fixed] Fixed issue were `Schema.double` set the format parameter in `Schema`. (#6432)
 
 # 16.0.1
 * [fixed] Fixed issue where authorization headers weren't correctly formatted and were ignored by the backend. (#6400)