Update location/name of codegangsta/cli (#982).

Also update description to match repository description.

README.md

@@ -131,7 +131,6 @@ Please take a quick gander at the [contribution guidelines](https://github.com/a
 * [cli-init](https://github.com/tcnksm/gcli) - The easy way to start building Golang command line application.
 * [climax](http://github.com/tucnak/climax) - An alternative CLI with "human face", in spirit of Go command
 * [cobra](https://github.com/spf13/cobra) - A Commander for modern Go CLI interactions
-* [codegangsta/cli](https://github.com/codegangsta/cli) - A small package for building command line apps in Go.
 * [docopt.go](https://github.com/docopt/docopt.go) - A command-line arguments parser that will make you smile.
 * [go-flags](https://github.com/jessevdk/go-flags) - go command line option parser
 * [kingpin](https://github.com/alecthomas/kingpin) - A command line and flag parser supporting sub commands.
@@ -140,6 +139,7 @@ Please take a quick gander at the [contribution guidelines](https://github.com/a
 * [mow.cli](https://github.com/jawher/mow.cli) - A Go library for building CLI applications with sophisticated flag and argument parsing and validation.
 * [readline](https://github.com/chzyer/readline) - A pure golang implementation that provide most of features in GNU-Readline under MIT license.
 * [ukautz/clif](https://github.com/ukautz/clif) - A small command line interface framework.
+* [urfave/cli](https://github.com/urfave/cli) - A simple, fast, and fun package for building command line apps in Go (formerly codegangsta/cli).
 * [wlog](https://github.com/dixonwille/wlog) - A simple logging interface that supports cross-platform color and concurrency.
 * [wmenu](https://github.com/dixonwille/wmenu) - An easy to use menu structure for cli applications that prompts users to make choices.