Invert towncrier logic

jenshnielsen · jenshnielsen · commit 953451a3d0ca · 2022-09-06T07:39:28.000+02:00
Towncrier 22.8 has fixed the logic such that single_file=False
really means single_file=False so invert the logic.
diff --git a/pyproject.toml b/pyproject.toml
@@ -244,7 +244,7 @@ filterwarnings = [
 package = "qcodes"
 name = "QCoDeS"
 directory = "docs/changes/newsfragments"
-single_file = true
+single_file = false
 filename = "docs/changes/{version}.rst"
 issue_format = ":pr:`{issue}`"
 
