Added filter and removed appending .png to file location string

src/main.rs

@@ -18,13 +18,13 @@ fn main() {
             let websitetext = binding.as_str();
             let result = FileDialog::new()
                 .set_location("~/Downloads")
+                .add_filter("Image", &["png", "jpg", "gif"])
                 .show_save_single_file()
                 .expect("Unknown File Path")
                 .unwrap();
             let mut savelocation = result.into_os_string().into_string().unwrap();
             let qrcode = QrCode::new(websitetext.as_bytes()).unwrap();
             let image = qrcode.render::<Luma<u8>>().build();
-            savelocation.push_str(".png");
             image.save(savelocation);
         }
     });