Fix sha256 printing code

Author: nikic

src/utils.rs

@@ -5,7 +5,7 @@ pub fn to_hex(sha: &Sha256) -> String {
     let bytes = sha.as_slice();
     let mut result = String::new();
     for byte in bytes {
-        result.push_str(&format!("{byte:0<2x}"));
+        result.push_str(&format!("{byte:0>2x}"));
     }
     result
 }