def value2bool(d):
  """
  Convert specific string values to boolean (input: dict, output: dict)
  'true' to True and 'false' to False
  """
  for k,v in d.items():
    if v.lower() == 'true':
      d[k] = True
    elif v.lower() == 'false':
      d[k] = False

  return d