scripts: Add script to create release notes

Signed-off-by: Povilas Kanapickas <povilas@radix.lt>

scripts/make_release_notes.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+
+set -e
+
+if [ $# -ne 1 ]; then
+    echo "Usage: make_release_notes.sh VERSION"
+    exit 1
+fi
+
+VERSION=$1
+towncrier build --version "$VERSION" --yes
+git mv "docs/Changelog-new.md" "docs/Changelog-$VERSION.md"
+git add "newsfragments/"
+git commit -m "Release notes for $VERSION"