[AutoPR Microsoft.Azure.Management.Cdn] change default version to be 2019-04

[openapi-sdkautomation]

Created to sync Azure/azure-rest-api-specs#7176

[openapi-sdkautomation]

Installation Instructions

In order to use the generated nuget package in your app, you will have to use it from a private feed.
To create a private feed, see the following link:
https://docs.microsoft.com/en-us/nuget/hosting-packages/local-feeds
This will allow you to create a new local feed and add the location of the new feed as one of the sources.

Direct Download

The generated package can be directly downloaded from here:

• Microsoft.Azure.Management.Cdn