Fix SQLx example

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "sqlite-hashes"
-version = "0.7.2"  # This value is also used in the README.md
+version = "0.7.3"  # This value is also used in the README.md
 description = "Hashing functions for SQLite with aggregation support: MD5, SHA1, SHA256, SHA512, FNV-1a, xxHash"
 authors = ["Yuri Astrakhan <YuriAstrakhan@gmail.com>"]
 repository = "https://github.com/nyurik/sqlite-hashes"

README.md

@@ -154,9 +154,11 @@ fn main() {
 To use with [SQLx](https://crates.io/crates/sqlx), you need to get the raw handle from the `SqliteConnection` and pass it to the registration function.
 
 ```rust,ignore
+use rusqlite::Connection;
+use sqlite_hashes::register_hash_functions;
 use sqlx::sqlite::SqliteConnection;
 
-async fn register_functions(sqlx_conn: &SqliteConnection) {
+async fn register_functions(sqlx_conn: &mut SqliteConnection) {
     // SAFETY: No query must be performed on `sqlx_conn` until `handle_lock` is dropped.
     let mut handle_lock = sqlx_conn.lock_handle().await.unwrap();
     let handle = handle_lock.as_raw_handle().as_ptr();