bcrypt-ruby is now just bcrypt

[kathgironpe]

I see the following dependencies:

songkick-oauth2-provider (0.10.2)
      activerecord
      bcrypt-ruby
      json
      rack

And I get this warning:

The bcrypt-ruby gem has changed its name to just bcrypt.  Instead of installing `bcrypt-ruby`, you should install `bcrypt`.  Please update your dependencies accordingly.

[kathgironpe]

@jivdhaliwal Thanks for fixing.