Updated Working for Android (markdown)

Working-for-Android.md

@@ -94,7 +94,7 @@ My pc os is win8.1 x64
 
 _Step 1.need to download these (需要下载这些)
 ```
-    msys2 https://www.msys2.org/
+    msys2-x86-64 https://www.msys2.org/
         run command in msys:
         pacman -S mingw-w64-i686-toolchain (select default 选择默认的)
         pacman -S mingw-w64-x86_64-make