README.md in intercom-2.4.4 vs README.md in intercom-2.5.4

@@ -17,11 +17,11 @@
 
     gem install intercom
 
 Using bundler:
 
-    gem 'intercom', "~> 2.4.4"
+    gem 'intercom', "~> 2.5.4"
 
 ## Basic Usage
 
 ### Configure your access credentials
 
@@ -60,10 +60,12 @@
 user = Intercom::User.find(:user_id => "1")
 # Find user by id
 user = Intercom::User.find(:id => "1")
 # Create a user
 user = Intercom::User.create(:email => "[e-mail]", :name => "Bob Smith", :signed_up_at => Time.now.to_i)
+# Delete a user
+deleted_user = Intercom::User.find(:id => "1").delete
 # Update custom_attributes for a user
 user.custom_attributes["average_monthly_spend"] = 1234.56; user.save
 # Perform incrementing
 user.increment('karma'); user.save
 # Iterate over all users
@@ -293,9 +295,27 @@
 The metadata key values in the example are treated as follows-
 - order_date: a Date (key ends with '_date').
 - stripe_invoice: The identifier of the Stripe invoice (has a 'stripe_invoice' key)
 - order_number: a Rich Link (value contains 'url' and 'value' keys)
 - price: An Amount in US Dollars (value contains 'amount' and 'currency' keys)
+
+*NB:* This version of the gem reserves the field name `type` in Event data.
+
+### Contacts
+
+`Contacts` represent logged out users of your application.
+
+```ruby
+# Create a contact
+contact = Intercom::Contact.create(email: "[e-mail]")
+
+# Update a contact
+contact.custom_attributes['foo'] = 'bar'
+contact.save
+
+# Find contacts by email
+contacts = Intercom::Contact.find_all(email: "[e-mail]")
+```
 
 ### Subscriptions
 
 Subscribe to events in Intercom to receive webhooks.