Add help entry for H global header shortcut.

libmproxy/console/help.py

@@ -49,6 +49,7 @@ class HelpView(urwid.ListBox):
         text.append(urwid.Text([("head", "\n\nGlobal keys:\n")]))
         keys = [
             ("c", "client replay"),
+            ("H", "edit global header set patterns"),
             ("i", "set interception pattern"),
             ("M", "change global default display mode"),
                 (None,
@@ -177,5 +178,3 @@ class HelpView(urwid.ListBox):
         elif key == "?":
             key = None
         return urwid.ListBox.keypress(self, size, key)
-
-