prompts 2.0.0

prompts: ^2.0.0 copied to clipboard

• Migrate to nullsafety and clean up linting problems.

See PR #7: https://github.com/thosakwe/prompts/pull/7

• Completely disable interactive selection on Windows.
  • https://github.com/thosakwe/prompts/pull/3

• Make choose only print options once, and instead add prompt.
• Add names to choose.
• conceal was true in chooseShorthand; revert to false.
• Always use AnsiCode.wrap, to prevent "hanging colors."
• Always heed the color flag.
• Use VT100 codes for clearing lines, etc. (smoother, no jank)
  • http://www.climagic.org/mirrors/VT100_Escape_Codes.html

• Add password reading options.
• Pin against Dart 2.

• Add pretty colors to get.

Initial version