chore(release): prepare v2.0.0v2.0.0

Update the project version and revision date for the 2.0.0 release.

Complete SPDX licensing metadata across project files and align the
supported Python classifiers with the new Python 3.12 minimum.

1 files changed, 6 insertions, 0 deletions

diff --git a/README.md b/README.md
index 9060b6f..63a7de1 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,9 @@
+<!--
+SPDX-FileCopyrightText: 2026 Dennis Fink <me+coding@dennisfink.me>
+
+SPDX-License-Identifier: BSD-3-Clause
+-->
+
 # prometheus-borgmatic-exporter
 
 A Prometheus metrics exporter for [borgmatic](https://torsion.org/borgmatic/),