Add client reset changelog entry

Forgot to add it in #1859.

CHANGELOG.md

@@ -3,6 +3,8 @@ vNEXT (TBD)
 
 ### Enhancements
 * Added `int IndexOf(object)` and `bool Contains(object)` to the `IRealmCollection` interface. (PR [#1893](https://github.com/realm/realm-dotnet/issues/1893))
+* Added support for faster initial downloads when using `Realm.GetInstanceAsync`. (Issue [1847](https://github.com/realm/realm-dotnet/issues/1847))
+* Added an optional `cancellationToken` argument to `Realm.GetInstanceAsync` enabling clean cancelation of the in-progress download. (PR [1859](https://github.com/realm/realm-dotnet/pull/1859))
 
 ### Fixed
 * Fixed an infinite recursion when calling `RealmCollectionBase<T>.IndexOf`. (Issue [#1892](https://github.com/realm/realm-dotnet/issues/1892))