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
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