Add github.com/sbstjn/hanu (#1139)

* Add github.com/sbstjn/hanu

* Add link to tutorial for github.com/sbstjn/hanu

* Update README.md

Remove additional link

README.md

@@ -621,6 +621,7 @@ See [go-hardware](https://github.com/rakyll/go-hardware) for a comprehensive lis
 * [gopsutil](https://github.com/shirou/gopsutil) - A cross-platform library for retrieving process and system utilization(CPU, Memory, Disks, etc).
 * [gosms](https://github.com/haxpax/gosms) - Your own local SMS gateway in Go that can be used to send SMS
 * [gountries](https://github.com/pariz/gountries) - A package that exposes country and subdivision data.
+* [hanu](https://github.com/sbstjn/hanu) - Framework for writing Slack bots.
 * [health](https://github.com/dimiro1/health) - A Easy to use, extensible health check library.
 * [indigo](https://github.com/osamingo/indigo) - A distributed unique ID generator of using Sonyflake and encoded by Base58.
 * [jobs](https://github.com/albrow/jobs) - A persistent and flexible background jobs library.