message: fix test bug
  The writer.create is supposed to hit a database constraint due to setting the less-than-ten field to 11. But it was errneously hitting the constraint by not setting that column at all ("lessThanTen" was being silently ignored).
diff: @@ -148,7 +148,7 @@ describe('postgresql/writer', function() {
  published: false,
  topic: 'x',
  'multi-word': 'hello',
  - lessThanTen: 11
  + 'less-than-ten': 11
  }
  }
  });
  