README.md in jt-rails-toolbox-2.3.1 vs README.md in jt-rails-toolbox-2.4.0

@@ -20,11 +20,11 @@
 
 ```yml
 production:
   exception:
     airbrake:
-      project_host: "https://errbit.example.com"
+      host: "https://errbit.example.com"
       project_id: 1
       project_key: 12345678901234567890
     slack:
       webhook_url: https://hooks.slack.com/services/XXXXXXXX
     email_prefix: '[ERROR]'
@@ -60,9 +60,10 @@
 send notifications when errors occur (email, slack)
 - [Airbrake](https://github.com/airbrake/airbrake), send notifications when errors occur to [Airbrake](https://airbrake.io/) or [Errbit](http://errbit.com/) 
 - [paperclip](https://github.com/thoughtbot/paperclip), manage file upload
 - [sidekiq](https://github.com/mperham/sidekiq), manage background jobs
 - [validates_email_format_of](https://github.com/validates-email-format-of/validates_email_format_of), who doesn't need to validate email format?
+- [validates_phone_format_of](https://github.com/jonathantribouharet/validates_phone_format_of), validate phone against E.164 format
 - [rails-i18n](https://github.com/svenfuchs/rails-i18n) Default locale data
 - [jt-rails-meta](https://github.com/jonathantribouharet/jt-rails-meta) Manage HTML meta tags
 - [jt-rails-generator-user](https://github.com/jonathantribouharet/jt-rails-generator-user) Generate a scaffold for user authentication
 - [jt-rails-tokenizable](https://github.com/jonathantribouharet/jt-rails-tokenizable) Generate tokens for ActiveRecord models
 - simplified configuration of hostnames and `ActionMailer` with a YAML file