message: Fix tests/sled_storage.rs
diff: use std::convert::TryFrom;
  #[cfg(feature = "sled-storage")]
  -use gluesql::{execute, generate_tests, sled, tests::*, Payload, Query, Result, SledStorage};
  +use gluesql::{
  + execute, generate_alter_table_tests, generate_tests, sled, tests::*, Payload, Query, Result,
  + SledStorage,
  +};
  #[cfg(feature = "sled-storage")]
  struct SledTester {
  