Missing dependencies in build instructions

[johnblommers]

trafficstars

Miro requires the following dependencies be installed before it can be built:

sudo apt install libx11-xcb-dev libxcb-shape0-dev \
                 libxcb-xfixes0-dev libxcb-xkb-dev \
                 libxcb-keysyms1-dev libxcb-icccm4-dev \
                 libxkbcommon-x11-dev

And while it should be obvious Rust itself needs be installed:

curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh

To ensure that Rust is up to date, along with other packages, consider running topgrade daily by hand.

[o2sh]

Sorry for your trouble @johnblommers, I added a get-deps script along with a more detailed "Installation" section in the Readme.md.