Rakefile: ensure the ATTN warning is merged before the test data, not after

On my system (yaml gem version 0.1.0), `foo.merge(bar)` will include the
keys of `foo` before the keys of `bar`, so the previous Rakebuild
definition would include the ATTN warning *after* the test data in the
rendered JSON files.

1 files changed, 2 insertions, 1 deletions

diff --git a/Rakefile b/Rakefile
index 5254ce6..1bbcc72 100644
--- a/Rakefile
+++ b/Rakefile
@@ -19,8 +19,9 @@ namespace :build do
       json_file = filename.gsub('.yml', '.json')
 
       File.open(json_file, 'w') do |file|
+        warning = {:__ATTN__ => note}
         doc = YAML.load_file(filename)
-        file << doc.merge(:__ATTN__ => note).to_json()
+        file << warning.merge(doc).to_json()
       end
     end
   end