Update to commit 7438f31 from git@github.com:gedex/wp-slack.git

Includes the following commit(s):

commit 7438f3196a53862b2323fc75cf27f61c991da542
Author: Akeda Bagus <akeda@x-team.com>

    Bump version to 0.4.1.

M	includes/plugin.php
M	readme.md
M	readme.txt
M	slack.php

commit 45a8b56cb06bee21edeb48d59385108d24ecc739
Author: Akeda Bagus <akeda@x-team.com>

    Fixed wrong text domain.

M	includes/event-manager.php


git-svn-id: https://plugins.svn.wordpress.org/slack/trunk@912749 b8457f37-d9ea-0310-8a92-e5e31aec5664