fix: fix formatting of message.

stevenhua0320 · stevenhua0320 · commit 3e092b1a8bf3 · 2026-02-20T00:40:17.000-05:00
diff --git a/src/diffpy/structure/structure.py b/src/diffpy/structure/structure.py
@@ -32,6 +32,8 @@
     base,
     "assignUniqueLabels",
     "assign_unique_labels",
+    removal_version,
+)
 addNewAtom_deprecation_msg = build_deprecation_message(
     base,
     "addNewAtom",
