README.md in amazon_auth-0.3.3 vs README.md in amazon_auth-0.4.0

@@ -4,10 +4,11 @@
 [![Build Status](https://travis-ci.org/kyamaguchi/amazon_auth.svg?branch=master)](https://travis-ci.org/kyamaguchi/amazon_auth)
 
 Sign In Amazon using Capybara and Selenium
 
 ![amazon_auth_login](https://cloud.githubusercontent.com/assets/275284/25064724/7f5faae4-223b-11e7-9fc6-4a82d1d727ab.gif)
+
 Recorded with [Recordit](http://recordit.co/)
 
 ## Installation
 
 Add this line to your application's Gemfile:
@@ -46,10 +47,26 @@
 Run `amazon_auth` and paste the output to _.env_.
 (`AMAZON_USERNAME_CODE` , `AMAZON_PASSWORD_CODE` and `AMAZON_CODE_SALT`)
 
 ![amazon_auth_setup](https://cloud.githubusercontent.com/assets/275284/25064607/9b9b80be-2238-11e7-95fc-c1547a83f178.gif)
 
+### envchain for security
+
+You can store environment variables in macOS Keychain instead of dotenv.
+Check out [envchain](https://github.com/sorah/envchain)
+
+```
+brew install envchain
+
+envchain --set amazon AMAZON_DOMAIN AMAZON_USERNAME_CODE AMAZON_PASSWORD_CODE AMAZON_CODE_SALT
+
+# Run console with envchain
+envchain amazon bin/console
+envchain amazon bundle exec irb
+envchain amazon rails console
+```
+
 ### Run
 
 In console, you can move around pages using Capybara DSL
 
 ```ruby
@@ -71,10 +88,24 @@
 
 Set `AMAZON_DOMAIN` in _.env_.
 
 e.g. `AMAZON_DOMAIN=amazon.co.jp` for Japanese site
 
+### Keep cookies
+
+Using [capybara-sessionkeeper gem](https://github.com/kyamaguchi/capybara-sessionkeeper)
+
+```
+client = AmazonAuth::Client.new(keep_cookie: true, debug: true)
+```
+
+You can change Capyabra.save_path when it isn't set
+
+```
+client = AmazonAuth::Client.new(keep_cookie: true, save_path: 'tmp/cookies', debug: true)
+```
+
 ### Logging
 
 Normal logging
 
 ```ruby
@@ -107,9 +138,13 @@
 In console,
 
 ```
 client = AmazonAuth::Client.new(driver: :firefox)
 ```
+
+## TODO
+
+- [Idea] Hook `submit_signin_form` after every `visit` and `click` action
 
 ## Development
 
 Use _.env.development_ instead of _.env_ in development.