[Svn] [roundcube/roundcubemail] 64078a: Add note about updatedb.sh script (#7515)

[Aleksander Machniak]

  Branch: refs/heads/master
  Home:   https://github.com/roundcube/roundcubemail
  Commit: 64078ab836dbe32292fb38f05aaa63337aa58860
      https://github.com/roundcube/roundcubemail/commit/64078ab836dbe32292fb38f05aaa63337aa58860
  Author: Aleksander Machniak <alec at alec.pl>
  Date:   2020-08-03 (Mon, 03 Aug 2020)

  Changed paths:
    M UPGRADING

  Log Message:
  -----------
  Add note about updatedb.sh script (#7515)