histedit: add newline after ui.log "# acttions to histedit" message

Differential Revision: https://phab.mercurial-scm.org/D5572

hgext/histedit.py

@@ -1900,7 +1900,7 b' def _newhistedit(ui, repo, state, revs, '
     state.topmost = topmost
     state.replacements = []
 
-    ui.log("histedit", "%d actions to histedit", len(actions),
+    ui.log("histedit", "%d actions to histedit\n", len(actions),
            histedit_num_actions=len(actions))
 
     # Create a backup so we can always abort completely.