README.md in twilio-ruby-5.10.5 vs README.md in twilio-ruby-5.10.6

@@ -25,17 +25,17 @@
 ## Installation
 
 To install using [Bundler][bundler] grab the latest stable version:
 
 ```ruby
-gem 'twilio-ruby', '~> 5.10.5'
+gem 'twilio-ruby', '~> 5.10.6'
 ```
 
 To manually install `twilio-ruby` via [Rubygems][rubygems] simply gem install:
 
 ```bash
-gem install twilio-ruby -v 5.10.5
+gem install twilio-ruby -v 5.10.6
 ```
 
 To build and install the development branch yourself from the latest source:
 
 ```bash
@@ -47,9 +47,12 @@
 ### Migration from 4.x
 [Upgrade Guide][upgrade]
 
 ## Documentation
 [Here][documentation]
+
+## Docker Image
+The `Dockerfile` present in this repository and its respective `twilio/twilio-ruby` Docker image are currently used by Twilio for testing purposes only.
 
 ## Feedback
 During the Release Candidate period of this library, please leave all feedback and issues in the [Github Issues][issues] for `twilio-ruby`.
 
 ## Getting Started