clippy: apply suggestions

src/qrcode/encoder/qrcode_encoder.rs

@@ -17,7 +17,7 @@
  * @author [email protected] (Satoru Takabayashi) - creator
  * @author [email protected] (Daniel Switkin) - ported from C++
  */
-use std::{collections::HashMap, io::Seek};
+use std::collections::HashMap;
 
 use unicode_segmentation::UnicodeSegmentation;