configitems: register the 'experimental.histedit.autoverb' config

hgext/histedit.py

@@ -215,6 +215,9 b' command = registrar.command(cmdtable)'
 
 configtable = {}
 configitem = registrar.configitem(configtable)
+configitem('experimental', 'histedit.autoverb',
+    default=False,
+)
 configitem('histedit', 'defaultrev',
     default=configitems.dynamicdefault,
 )