Allow calling a deprecated openssl method

Author: carols10cents

src/util/hasher.rs

@@ -16,6 +16,7 @@ impl<R: Read> HashingReader<R> {
     }
 
     pub fn finalize(mut self) -> Vec<u8> {
+        #[allow(deprecated)]
         self.hasher.finish().unwrap()
     }
 }