add a .keep file so that the changelog dir won't be removed

SteveLauC · SteveLauC · commit 9e1e9f02d2e6 · 2023-10-07T09:19:57.000+08:00
diff --git a/changelog/.keep b/changelog/.keep
@@ -0,0 +1,5 @@
+Do not remove this file. This is used to keep the `changelog` dir around after
+generating new changelog file.
+
+Without this, `towncrier` would remove the changelog files as well as the 
+directory if it is empty.
