Update README.md

Vince1171 · Apr 20, 2019 · b4fb49e · b4fb49e
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 ### For Ubuntu Touch
 
+before the installation, you'll need to format your userdata and your cache partition to ext4. Be careful, it'll erase all your personal files (like pictures, etc...)
+
 just use the prebuild image just as  a normal compiled image.
 install it with the JBB's halium-install script [here](https://github.com/JBBgameich/halium-install)
 and get the ubports edge rootfs from [here](https://ci.ubports.com/job/xenial-rootfs-armhf/lastSuccessfulBuild/artifact/out/ubports-touch.rootfs-xenial-armhf.tar.gz)