Add a newline to serialization results

Otherwise editing the output in an editor
is likely to make the data not match anymore,
since most editors will add a final newline.

Update all tests

1 files changed, 1 insertions, 1 deletions

diff --git a/tests/layouts/valid-6.layout b/tests/layouts/valid-6.layout
index 7f103a8f..d74ff4eb 100644
--- a/tests/layouts/valid-6.layout
+++ b/tests/layouts/valid-6.layout
@@ -406,4 +406,4 @@
       }
     ]
   }
-}
\ No newline at end of file
+}