Another level of dict also in merge_domaindata()

src/sphinx_last_updated_by_git.py

@@ -287,7 +287,7 @@ def clear_doc(self, docname):
         self.timestamps.pop(docname, None)
 
     def merge_domaindata(self, docnames, otherdata):
-        for k, v in otherdata.items():
+        for k, v in otherdata['timestamps'].items():
             if k in docnames:
                 self.timestamps[k] = v