README.md in intercom-3.9.0 vs README.md in intercom-3.9.2

@@ -21,11 +21,11 @@
 
     gem install intercom
 
 Using bundler:
 
-    gem 'intercom', '~> 3.8.1'
+    gem 'intercom', '~> 3.9.0'
 
 ## Basic Usage
 
 ### Configure your client
 
@@ -468,13 +468,17 @@
 # Please see users scroll for more details of how to use scroll
 ```
 
 #### Customers
 
+Our Customer API is a central place for all the information on your customers, whether they're users or leads. More detail in our API documentation on [Customers](https://developers.intercom.com/intercom-api-reference/v0/reference#customers).
+
+```ruby
 # Search for customers
 customers = intercom.customers.search(query: { "field": "name", "operator": "=", "value": "Alice"}, per_page: 50, sort_field: "name", sort_order: "ascending")
 customers.each { |customer| p customer.name }
+```
 
 #### Counts
 
 ```ruby
 # App-wide counts
@@ -554,5 +558,26 @@
   multiple pull requests.
 
 - **Send coherent history**. Make sure each individual commit in your pull
   request is meaningful. If you had to make multiple intermediate commits while
   developing, please squash them before sending them to us.
+
+### Development
+
+#### Running tests
+
+```bash
+# all tests
+bundle exec spec
+
+# unit tests
+bundle exec spec:unit
+
+# integration tests
+bundle exec spec:integration
+
+# single test file
+bundle exec m spec/unit/intercom/job_spec.rb
+
+# single test
+bundle exec m spec/unit/intercom/job_spec.rb:49
+```