Update to commit faf6874 from git@github.com:gedex/wp-slack.git

Includes the following commit(s):

commit faf6874b33a41f1bbfd6aeba91da21efba14eceb
Author: Akeda Bagus <akeda@x-team.com>

    Added extension plugins list.

M	readme.md
M	readme.txt


git-svn-id: https://plugins.svn.wordpress.org/slack/trunk@902675 b8457f37-d9ea-0310-8a92-e5e31aec5664