function notClose (actual, expected, minDifference, message) {
  const actualDiff = Math.abs(actual - expected)
  const result = actualDiff > minDifference
  message = message || (actual + ' should not be within ' + minDifference + ' (exclusive) of ' + expected + (result ? '' : '. Actual: ' + actualDiff))
  return { result, message, actual, expected }
}
Checks that the first two arguments are numbers with differences greater than the specified
minimum difference.

@example assert.notClose(3.1, Math.PI, 0.001);

@param {Float} actual
@param {Float} expected
@param {Float} minDifference (the minimum exclusive difference allowed between the actual and expected numbers)
@param {string} [message] Defaults to structured message
@returns {InfoObject}