allow "0" as a build-id

src/atom/parsers.rs

@@ -57,6 +57,7 @@ impl<'a> Parseable<'a, &'a str> for BuildId {
         start
             .and(rest)
             .recognize()
+            .or(tag("0"))
             .map(|output: &str| BuildId(output.to_string()))
     }
 }