message: Fix src/lib.rs doc comment,
  Rename gluesql_sled_storage to sled-storage.
  Fix it to work with or without sled-storage feature
diff: //! ## Examples
  //!
  //! ```
  -//! #![cfg(feature = "gluesql_sled_storage")]
  +//! #[cfg(feature = "sled-storage")]
  +//! fn main() {
  //! use gluesql::prelude::*;
  //!
  //! let storage = SledStorage::new("data/doc-db").unwrap();
  //! let output = glue.execute(sql).unwrap();
  //! println!("{:?}", output)
  //! }
  +//! }
  +//!
  +//! #[cfg(not(feature = "sled-storage"))]
  +//! fn main() {}
  //! ```
  //!
  //! ## Custom Storage
  