message: Update README.md
  Update usage code example to use explicit imports
diff: @@ -20,7 +20,7 @@ gluesql = { version = "0.1.15", features = ["sled-storage"] }
  ### Usage
  ```rust
  -use gluesql::*;
  +use gluesql::{parse, Glue, SledStorage};
  fn main() {
  let storage = SledStorage::new("data.db").unwrap();
  