Handle posting to #lit

As a User, I'd like to be able to tell randbot to make a post to the #lit channel

Requirements

Posting to #lit should happen through randbot by passing it a link
Randbot should validate that the link is a hashtag gaming post link
- Validate that it matches https://hashtaggaming.slack.com/archives/
  Secondary
Create an alias of "its lit fam [link]"
Have randbot monitor the activity in #lit and remove posts not made by itself
- If possible, threads are ok
  Criteria for acceptance
[x] Calling @randbot lit [link] should post that link to the #lit channel