Update README.md section Ubuntu

I'd try and pass test for cross-compile on ubuntu to windows i386 and x86_64, my case: https://github.com/hi20160616/robotclick/blob/main/.github/workflows/goreleaser.yml

I dig and read many issues here,  and collect the right way to cross-compile for windows binary.  
I think it will help someone like me to fix bugs while cross compile.  
like error `zlib.h cannot find out` usually because of we installed it via source, that not useful on **mingw-w64**.  
I also suggest this update to let newbee easy to use this grand code.
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hi20160616 2021-08-17 12:32:33 +08:00 committed by GitHub
parent 336f647d75
commit 20a44db075

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@ -88,6 +88,10 @@ sudo apt install xcb libxcb-xkb-dev x11-xkb-utils libx11-xcb-dev libxkbcommon-x1
sudo apt install libxkbcommon-dev
sudo apt install xsel xclip
sudo apt-get install gcc-multilib
sudo apt-get install gcc-mingw-w64
sudo apt install libz-mingw-w64-dev
```
#### Fedora: