uncomments STS token option

Signed-off-by: Akash Manohar J <akash@akash.im>

Author: HashNuke

app/models/attachment.rb

@@ -9,8 +9,8 @@ class Attachment < ActiveRecord::Base
                     :storage         => :s3,
                     :s3_credentials  => {
                       :access_key_id     => ENV['S3_ACCESS_KEY_ID'],
-                      :secret_access_key => ENV['S3_SECRET_ACCESS_KEY']#,
-                      # :session_token     => ENV['STS_SESSION_TOKEN']
+                      :secret_access_key => ENV['S3_SECRET_ACCESS_KEY'],
+                      :session_token     => ENV['STS_SESSION_TOKEN']
                     },
                     :bucket            => ENV['S3_BUCKET'],
                     :url             => "/:attachment/:id/:style/:basename.:extension",