Completed!
Last thing I have added was random trending git repo. When searching freeapis i found interesting one. Which was official github api. So, now I can get random open source project by command. Well it was pretty straightforward to implement. The new thing I learned was mrkdwn format use in slackbot respond, i had to make clickable link.

Also I spent time making readme readable and making demo md. I looked throught projects of others and tried to get best from other.
So, i made channel for my bot for ease of testing.
Also, i had removed joke function from tutorial as api seeps to fail.

Also, I have uploaded bot to the nest! it actually had problems, but they were easy to solve, I just accidentally added extra text in .env file, but it was fixed.