Missing linux dep.

Author: Narsil

.github/workflows/rust.yml

@@ -20,7 +20,7 @@ jobs:
         include:
         - os: ubuntu-latest
           headless: Xvfb :99 -screen 0 1024x768x24 > /dev/null 2>&1 &
-          dependencies: sudo apt-get install libxtst-dev libevdev-dev --assume-yes
+          dependencies: sudo apt-get install libxtst-dev libevdev-dev libudev-dev --assume-yes
           test: cargo test --verbose --features=serialize,x11
         - os: macos-latest
           # TODO: We can't test this on github, we can't set accessibility yet.