update default package tag

Oluwatosin Adewale · Tosin Adewale · commit 7127d2af7cd8 · 2020-03-17T18:19:06.000-07:00
diff --git a/specification/containerregistry/resource-manager/readme.md b/specification/containerregistry/resource-manager/readme.md
@@ -26,7 +26,7 @@ These are the global settings for the ContainerRegistry API.
 
 ``` yaml
 openapi-type: arm
-tag: package-2019-06-preview
+tag: package-2019-12-preview
 ```
 
 
