Issue #163: update doc for xz on windows

Author: cfig

.github/workflows/main.yml

@@ -87,7 +87,7 @@ jobs:
         run: python -c "import sys; print(sys.version)"
 
       - name: choco
-        run: choco install openssl dtc-msys2 zip vim
+        run: choco install openssl dtc-msys2 zip vim xz
 
       - name: Unit Test
         run: ./gradlew.bat check && ./gradlew.bat clean || true

README.md

@@ -12,7 +12,7 @@ Make sure you have [JDK11+](https://www.oracle.com/java/technologies/downloads/#
 * Mac: `brew install lz4 xz dtc`
 
 * Windows: Install openssl and device-tree compiler with [chocolate](https://chocolatey.org/install)
-`choco install openssl dtc-msys2 zip vim`
+`choco install openssl dtc-msys2 zip vim xz`
 
 ## Getting Started
 Put your boot.img to current directory, then start gradle 'unpack' task: