RaspberryPi binary

RaspberryPi binary is now created as part of the release process

Adding `me` user to self reference

Now the command /tube for me will return the lines the user has subscribed to (if any)

Improved help when no command is specified

When no command is specified help will display all the possible available options.

v2.2.1

Fix slack username read (excluding @ symbol)

Adding command `/tube for @name`

This command retrieves the tube status for a specific user who subscribed to tube lines.

v2.1.1

Now deploy_prod.sh pulls binary from GitHub

v2.1.0: Update usage of go-tfl library

Now the caller provides the `*http.Client` (timeout set to 5 seconds)

v2.0.6

Enable publish to GitHub

v2.0.5

Adding echo to show CircleCI variables

v2.0.4

Adding release binary upload to GitHub