underlineRgb16m method Null safety

Chalk underlineRgb16m(
  1. num red,
  2. num green,
  3. num blue
)

Create Chalk with an underline of the the specified RGB color (forces using ANSI 16m SGR codes, even if level is not 3) WARNING: on some consoles without support for this, such as Android Studio, using this will prevent ALL styles of the Chalk from appearing

Implementation

Chalk underlineRgb16m(num red, num green, num blue) =>
    _makeUnderlineChalk(red, green, blue, force16M: true);