Log Message:
devel/ruby-tty-prompt: add version 0.20.0 package

Add ruby-tty-prompt version 0.20.0 package.

# TTY::Prompt

> A beautiful and powerful interactive command line prompt.

TTY::Prompt provides independent prompt component for TTY
(https://github.com/piotrmurach/tty) toolkit.

## Features

* Number of prompt types for gathering user input
* A robust API for validating complex inputs
* User friendly error feedback
* Intuitive DSL for creating complex menus
* Ability to page long menus
* Support for Linux, OS X, FreeBSD and Windows systems