Adding tabby (avelino#2394)

- github.com repo: https://github.com/cheynewallace/tabby
- godoc.org: https://godoc.org/github.com/cheynewallace/tabby
- goreportcard.com: https://goreportcard.com/report/github.com/cheynewallace/tabby
- coverage service link  [![cover.run](https://cover.run/go/github.com/cheynewallace/tabby.svg?style=flat&tag=golang-1.10)](https://cover.run/go?tag=golang-1.10&repo=github.com%2Fcheynewallace%2Ftabby)


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- [x] I have added my package in alphabetical order.
- [x] I have an appropriate description with correct grammar.
- [x] I know that this package was not listed before.
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- [x] I have added coverage service link to the repo and to my pull request.
- [x] I have added goreportcard link to the repo and to my pull request.
- [x] I have read [Contribution guidelines](https://github.com/avelino/awesome-go/blob/master/CONTRIBUTING.md#contribution-guidelines), [maintainers note](https://github.com/avelino/awesome-go/blob/master/CONTRIBUTING.md#maintainers) and [Quality standard](https://github.com/avelino/awesome-go/blob/master/CONTRIBUTING.md#quality-standard).

Thanks for your PR, you're awesome! 👍

README.md

@@ -233,6 +233,7 @@ Please take a quick gander at the [contribution guidelines](https://github.com/a
 * [mpb](https://github.com/vbauerster/mpb) - Multi progress bar for terminal applications.
 * [progressbar](https://github.com/schollz/progressbar) - Basic thread-safe progress bar that works in every OS.
 * [simpletable](https://github.com/alexeyco/simpletable) - Simple tables in terminal with Go.
+* [tabby](https://github.com/cheynewallace/tabby) - A tiny library for super simple Golang tables.
 * [tabular](https://github.com/InVisionApp/tabular) - Print ASCII tables from command line utilities without the need to pass large sets of data to the API.
 * [termbox-go](https://github.com/nsf/termbox-go) - Termbox is a library for creating cross-platform text-based interfaces.
 * [termdash](https://github.com/mum4k/termdash) - Go terminal dashboard based on **termbox-go** and inspired by [termui](https://github.com/gizak/termui).