website: doc upper and lower

CHANGELOG.md

@@ -11,6 +11,8 @@ FEATURES:
   * **New Post-Processor: `docker-save`** - Save an image. This is similar to
       export, but preserves the image hierarchy.
   * **New Post-Processor: `docker-tag`** - Tag a created image.
+  * **New Template Functions: `upper`, `lower`** - See documentation for
+      more details.
   * core: Plugins are automatically discovered if they're named properly.
       Packer will look in the PWD and the directory with `packer` for
       binaries named `packer-TYPE-NAME`.

website/source/docs/templates/configuration-templates.html.markdown

@@ -53,10 +53,12 @@ While some configuration settings have local variables specific to only that
 configuration, a set of functions are available globally for use in _any string_
 in Packer templates. These are listed below for reference.
 
-* `pwd` - The working directory while executing Packer.
 * `isotime` - UTC time in RFC-3339 format.
+* `lower` - Lowercases the string.
+* `pwd` - The working directory while executing Packer.
 * `timestamp` - The current Unix timestamp in UTC.
 * `uuid` - Returns a random UUID.
+* `upper` - Uppercases the string.
 
 ## Amazon Specific Functions