[Svn] [roundcube/roundcubemail] e4dc3e: Bump version to 1.3.15

[Thomas B.]

  Branch: refs/heads/release-1.3
  Home:   https://github.com/roundcube/roundcubemail
  Commit: e4dc3e942c79271f7e0933d91895e7fcd810ec44
      https://github.com/roundcube/roundcubemail/commit/e4dc3e942c79271f7e0933d91895e7fcd810ec44
  Author: Thomas Bruederli <thomas at roundcube.net>
  Date:   2020-08-10 (Mon, 10 Aug 2020)

  Changed paths:
    M CHANGELOG
    M index.php
    M installer/index.php
    M program/include/iniset.php
    M program/lib/Roundcube/bootstrap.php
    M public_html/index.php

  Log Message:
  -----------
  Bump version to 1.3.15