Merge pull request #23 from yatharthmathur/ym_fix_persist_db_method

fix: file should be closed

src/data_store/store.rs

@@ -43,7 +43,7 @@ impl KeyValueStore {
     fn _persist_db(&mut self) {
         /// open file
         /// write in binary
-        ///
+        /// close file
         todo!();
     }