Add optional compression for UPX.

Author: Aetopia

README.md

@@ -2,5 +2,5 @@
 A tool to restart all installed display adapters.
 
 # Building
-1. Install [GCC](https://winlibs.com/) & [UPX](https://upx.github.io).
+1. Install [GCC](https://winlibs.com/) & [UPX](https://upx.github.io) for optional compression.
 2. Run [`Build.cmd`](Build.cmd).