Fix warnings

src/data_provider/import.rs

@@ -1,6 +1,4 @@
-use crate::lang::WordData;
-use rusqlite::fallible_iterator::FallibleIterator;
-use rusqlite::{Connection, MappedRows};
+use rusqlite::Connection;
 use serde_json::Value;
 use std::collections::HashMap;