Add HackerNewsBot

I have created a bot that will post Hacker News stories with 100+ points. Adding it to the list.

docs/Using-Mastodon/Apps.md

@@ -13,5 +13,6 @@ Some people have started working on apps for the Mastodon API. Here is a list of
 |Albatross|iOS||[@goldie_ice@mastodon.social](https://mastodon.social/users/goldie_ice)|
 |Tooter|Chrome|<https://github.com/ineffyble/tooter>|[@effy@mastodon.social](https://mastodon.social/users/effy)|
 |tootstream|CLI|<https://github.com/magicalraccoon/tootstream>|[@Raccoon@mastodon.social](https://mastodon.social/users/Raccoon)|
+|HackerNewsBot|CLI|<https://github.com/raymestalez/mastodon-hnbot>|[@rayalez@hackertribe.io](https://hackertribe.io/users/rayalez)|
 
 If you have a project like this, let me know so I can add it to the list!