CHANGELOG.md: entry added

Author: dconeybe

firebase-dataconnect/CHANGELOG.md

@@ -2,6 +2,11 @@
 * [changed] Removed the "beta" suffix from the version of the Firebase Data
   Connect Android SDK, thus graduating it from "beta" to "generally available".
   ([#6792](https://github.com/firebase/firebase-android-sdk/pull/6792))
+* [changed] DataConnectOperationException added, enabling support for partial
+  errors; that is, any data that was received and/or was able to be decoded is
+  now available via the "response" property of the exception thrown when a
+  query or mutation is executed.
+  ([#NNNN](https://github.com/firebase/firebase-android-sdk/pull/NNNN))
 * [changed] Changed gRPC proto package to v1 (was v1beta).
   ([#6729](https://github.com/firebase/firebase-android-sdk/pull/6729))