fix warnings

[mcfiredrill]

 application :redix is used by the current a
pplication but the current application does 
not depend on :redix. To fix this, you must 
do one of:                                  
                                            
  1. If :redix is part of Erlang/Elixir, you
 must include it under :extra_applications i
nside "def application" in your mix.exs     

  2. If :redix is a dependency, make sure it
 is listed under "def deps" in your mix.exs
                                            
  3. In case you don't want to add a require
ment to :redix, you may optionally skip this
 warning by adding [xref: [exclude: [Redix.P
ubSub]]] to your "def project" in mix.exs   
                                            
Invalid call found at 2 locations: 
  web/channels/room_channel.ex:23: Chat.Room
Channel.join/3                              
  web/channels/user_notification_channel.ex:
6: Chat.UserNotificationChannel.join/3

There's a few like this I don't know why

[warning] The :pubsub key in your Chat.Endpo
int is deprecated.                          
                                            
You must now start the pubsub in your applic
ation supervision tree.
Go to lib/my_app/application.ex and add the 
following:

    {Phoenix.PubSub, [name: Chat.PubSub, ada
pter: Phoenix.PubSub.PG2]}

Now, back in your config files in config/*, 
you can remove the :pubsub
key and add the :pubsub_server key, with the
 PubSub name: