message: Close filehandle to keras.json when initializing config
diff: @@ -5876,7 +5876,8 @@ else:
  _config_path = os.path.expanduser(os.path.join(_keras_dir, 'keras.json'))
  if os.path.exists(_config_path):
  try:
  - _config = json.load(open(_config_path))
  + with open(_config_path) as fh:
  + _config = json.load(fh)
  except ValueError:
  _config = {}
  _floatx = _config.get('floatx', floatx())
  