[TOC] Add Category.

The 11.1.0 patch introduces a new addon grouping method, Category, which can collapse addons of the same Category.
This is a commit that will verify whether this feature is available.
source: https://warcraft.wiki.gg/wiki/Patch_11.1.0/API_changes

AllTheThings.toc

@@ -1,6 +1,8 @@
 ## Title: AllTheThings
 ## IconTexture: Interface/Addons/AllTheThings/assets/logo_32x32
 ## Name: AllTheThings
+## Category: Collect
+## Category-zhTW: 收藏
 ## Notes: Addon for Tracking Collections & Account Completion
 ## Author: Crieve-Sargeras
 ## Version: @project-version@