Fix problem with parsing output from different versions of dig

src/dig_response.rs

@@ -73,14 +73,18 @@ impl DigResponse {
         );
         if cmd.status.success() {
             Ok(serde_yaml_ng::from_str(
-                String::from_utf8(cmd.stdout.into_iter().skip(2).collect())
-                    // we skip two here --------------------------^
-                    // because the dig output starts with "-\n" which fails to parse.
-                    .map_err(|error| {
-                        error!(domain:?, error:?; "couldn't convert command output to a string");
-                        error
-                    })?
-                    .as_str(),
+                String::from_utf8(if cmd.stdout.starts_with(b"-\n") {
+                    cmd.stdout.into_iter().skip(2).collect()
+                } else {
+                    cmd.stdout
+                })
+                // we skip two here --------------------------^
+                // because the dig output starts with "-\n" which fails to parse.
+                .map_err(|error| {
+                    error!(domain:?, error:?; "couldn't convert command output to a string");
+                    error
+                })?
+                .as_str(),
             )?)
         } else {
             error!(status:? = cmd.status,