README.md in push_package-0.1.3 vs README.md in push_package-0.2.0

@@ -19,10 +19,13 @@
 
 ## Notes:
 
 You must obtain a Website Push certificate from apple which requires a iOS developer license or a Mac developer license
 
+[Starting February 2016](https://developer.apple.com/support/certificates/expiration/), you will also need a copy of the
+Apple intermediate cert ([WWDR Certificate, expiring 02/07/23](https://developer.apple.com/certificationauthority/AppleWWDRCA.cer))
+
 ```ruby
 require 'push_package'
 
 website_params = {
   websiteName: "Bay Airlines",
@@ -33,10 +36,11 @@
   webServiceURL: "https://example.com/push"
 }
 
 iconset_path = 'path/to/iconset'
 certificate = 'path/to/certificate.p12' # or certificate_string
-package = PushPackage.new(website_params, iconset_path, certificate, 'optional cert password')
+intermediate_cert = 'path/to/AppleWWDRCA.cer'
+package = PushPackage.new(website_params, iconset_path, certificate, 'optional cert password', intermediate_cert)
 package.save('path/to/save')
 
 ```
 
 ```shell