colors$1 = function getColorizer (useColors = false) {
  return useColors ? coloredColorizer : plainColorizer
}
Factory function get a function to colorized levels. The returned function
also includes a `.message(str)` method to colorize strings.

@param {boolean} [useColors=false] When `true` a function that applies standard
terminal colors is returned.

@returns {function} `function (level) {}` has a `.message(str)` method to
apply colorization to a string. The core function accepts either an integer
`level` or a `string` level. The integer level will map to a known level
string or to `USERLVL` if not known.  The string `level` will map to the same
colors as the integer `level` and will also default to `USERLVL` if the given
string is not a recognized level name.