Bump version.

CHANGELOG.md

@@ -10,6 +10,10 @@ SPDX-License-Identifier: GPL-3.0-or-later OR EUPL-1.2+
 
 ## Unreleased
 
+No changes yet!
+
+## v0.12.0
+
 ### Visible changes
 
 - The new command-line parameter `--keep-going` (`-k` for short) allows to

README.md

@@ -65,7 +65,7 @@ $ acc-py app run acc-app-optimisation
 
 ```shell-session
 $ # Run a specific version.
-$ acc-py app run --version 0.11.0 acc-app-optimisation
+$ acc-py app run --version 0.12.0 acc-app-optimisation
 ```
 
 This runs the GUI in a completely sealed virtual environment. This means that