v0.41.0

What's Changed

• K-nearest neighbor (KNN) vector searches support by @abdolence in #165
  Details: https://cloud.google.com/firestore/docs/vector-search

  Fluent API supports searching with a new find_nearest method and a new type FirestoreVector.
  Example: https://github.com/abdolence/firestore-rs/blob/master/examples/nearest-vector-query.rs

Full Changelog: v0.40.1...v0.41.0