message: support "edit" command
diff: @@ -74,6 +74,7 @@ export const commandParsers = {
  s: parseSubstituteCommandArgs,
  e: fileCmd.parseEditFileCommandArgs,
  + edit: fileCmd.parseEditFileCommandArgs,
  ene: fileCmd.parseEditNewFileCommandArgs,
  enew: fileCmd.parseEditNewFileCommandArgs,
  