Setup Circle CI, add brakeman config (#13)

* Add circle ci config

* Change config to fix tests

* Update config

* Fix eslint command, add brakeman

app/controllers/api/v1/webhooks_controller.rb

@@ -17,7 +17,7 @@ class Api::V1::WebhooksController < ApplicationController
   private
   def login_from_basic_auth
     authenticate_or_request_with_http_basic do |username, password|
-      username == '' && password == ''
+      username == ENV['CHARGEBEE_WEBHOOK_USERNAME'] && password == ENV['CHARGEBEE_WEBHOOK_PASSWORD']
     end
   end