firestore 0.61.1

Library provides a simple API for Google Firestore and own Serde serializer based on efficient gRPC API
Documentation 
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# Update/delete preconditions

The library supports the preconditions:

```rust,no_run
# use firestore::*;
# use serde::{Deserialize, Serialize};
# #[derive(Debug, Clone, Deserialize, Serialize)]
# struct MyTestStructure {
#     some_num: u64,
# }
# const TEST_COLLECTION_NAME: &str = "test";
# async fn example(db: FirestoreDb) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
let object_updated: MyTestStructure = db
    .fluent()
    .update()
    .fields(paths!(MyTestStructure::{some_num}))
    .in_col(TEST_COLLECTION_NAME)
    .precondition(FirestoreWritePrecondition::Exists(true))
    .document_id("test-1")
    .object(&MyTestStructure { some_num: 1 })
    .execute()
    .await?;
# let _ = object_updated;
# Ok(())
# }
```