Update Amazon-Elastic-Beanstalk.md

Updated 'Dockerrun.aws.zip' link to newer, existing version

doc/install/Amazon-Elastic-Beanstalk.md

@@ -1,6 +1,6 @@
 
 ## AWS Elastic Beanstalk Setup (Docker)
-These instructions will guide you through the process of setting up Mattermost for product evaluation using an EBS Docker single-container application using [Dockerrun.aws.zip](https://github.com/mattermost/platform/raw/master/docker/1.1/Dockerrun.aws.zip).
+These instructions will guide you through the process of setting up Mattermost for product evaluation using an EBS Docker single-container application using [Dockerrun.aws.zip][Dockerrun.aws].
 
 1. From your [AWS console]( https://console.aws.amazon.com/console/home) select **Elastic Beanstalk** under the Compute section.
 2. Select **Create New Application** from the top right.
@@ -11,7 +11,7 @@ These instructions will guide you through the process of setting up Mattermost f
 	1. Set Predefined Configuration to **Docker** under the generic heading in the drop-down list. 
 	2. Set Environment Type to **Single instance** in the drop-down list.
 	3. Click **Next**.
-7. For Application Source, select **Upload your own** and upload the [Dockerrun.aws.zip](https://github.com/mattermost/platform/raw/master/docker/1.1/Dockerrun.aws.zip) file, then click **Next**.
+7. For Application Source, select **Upload your own** and upload the [Dockerrun.aws.zip][Dockerrun.aws] file, then click **Next**.
 8. Type an Environment Name and URL. Make sure the URL is available by clicking **Check availability**, then click **Next**.
 9. The options on the Additional Resources page may be left at default unless you wish to change them. Click **Next**.
 10. On the Configuration Details page, 
@@ -24,3 +24,5 @@ These instructions will guide you through the process of setting up Mattermost f
 	
 ### (Recommended) Enable Email 
 The default single-container Docker instance for Mattermost is designed for product evaluation, and sets `SendEmailNotifications=false` so the product can function without enabling email. To see the product's full functionality, [enabling SMTP email is recommended](SMTP-Email-Setup.md).
+
+[Dockerrun.aws]: https://github.com/mattermost/platform/raw/master/docker/1.4/Dockerrun.aws.zip