lib: Ignore dead_code warning

I'm not fmiliar with this crate, so let's just ignore the warning for
now instead of removing the code.

Signed-off-by: Fabiano Fidêncio <fidencio@northflank.com>

src/lib.rs

@@ -231,6 +231,7 @@ mod sealed {
             })
         }
 
+        #[allow(dead_code)]
         fn get(&self, key: &str) -> Result<String> {
             self.open_path(key, false).and_then(|mut file: File| {
                 let mut string = String::new();