rename multi barcode methods to snake case

src/pdf417/pdf_417_reader.rs

@@ -63,14 +63,14 @@ impl Reader for PDF417Reader {
     }
 }
 impl MultipleBarcodeReader for PDF417Reader {
-    fn decodeMultiple(
+    fn decode_multiple(
         &mut self,
         image: &crate::BinaryBitmap,
     ) -> Result<Vec<crate::RXingResult>, crate::Exceptions> {
-        self.decodeMultipleWithHints(image, &HashMap::new())
+        self.decode_multiple_with_hints(image, &HashMap::new())
     }
 
-    fn decodeMultipleWithHints(
+    fn decode_multiple_with_hints(
         &mut self,
         image: &crate::BinaryBitmap,
         hints: &crate::DecodingHintDictionary,