Update project version to 0.2.2

pyproject.toml:
Update project version to 0.2.2

pyproject.toml

 [tool.poetry]
 name = "arch-release-promotion"
-version = "0.2.1"
+version = "0.2.2"
 description = "Promote official Arch Linux releases and synchronize them"
 authors = ["David Runge <dvzrv@archlinux.org>"]
 license = "GPL-3.0-or-later"