Enhance docu: Update xiaomi robot V1

[backupandforkacc]

In the releases there is a link to a description how to update v2 and v3, but not v1.

"This is the service update for 0.10 RE release, verified on S55 (fw 2034).
Changes in this version:

    Fixed an issue with scheduled zoned cleaning;
    @Braintoe updated German translation.

This release includes a pre-build image for Gen2 based on firmware version 2034 and an image for Gen1 based on firmware version 4028. Both are built by vacuumz image builder and use password "cleaner" for root login at SSH by default. You are advised to change it right after install - you know it for sure.

If you already have a previous release installed, you can install only RE update using a deb file (for gen1) or via [this guide](https://github.com/rand256/valetudo/wiki/Updating-valetudo-binary-on-2008-firmware) (for gen2 and 3)."

This should be added as an explanation how to update v1:

sudo wget https://github.com/rand256/valetudo/releases/download/0.10.5/valetudo-re_0.10.5_armhf.deb
sudo dpkg -i valetudo-re_0.10.5_armhf.deb

I think there is even a chance to define the latest release here, but I cannot remember.

[pidator]

https://github.com/rand256/valetudo/releases/latest/

is the tag for the current release.
The linked manual can be used for a Gen1 too, you'll just have to replace the /etc/init/S11valetudo with service valetudo.

[backupandforkacc]

So the explanation I posted in the first post (wget, then dpkg) works too? I have not tested it yet.

[pidator]

I've never used dpkg to install valetudo re either.

[glchernenko1]

Don't forget to stop Valetudo before updating

service valetudo stop
wget https://github.com/rand256/valetudo/releases/download/0.10.10/valetudo-re_0.10.10_armhf.deb 
dpkg -i valetudo-re_0.10.10_armhf.deb 
service valetudo start

P.s. Use sudo for all commands or log in as root