Update changelog

CHANGELOG.md

@@ -1,6 +1,12 @@
 # 2019-08-21
 
-## Google Hangouts support
+## Slack bridging support
+
+Thanks to the [great work](https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/205) of [kingoftheconnors](https://github.com/kingoftheconnors) and [Stuart Mumford (Cadair)](https://github.com/Cadair), the playbook now supports bridging to [Slack](https://slack.com) via the [appservice-slack](https://github.com/matrix-org/matrix-appservice-slack) bridge.
+
+Additional details are available in [Setting up Appservice Slack bridging](docs/configuring-playbook-bridge-appservice-slack.md).
+
+## Google Hangouts bridging support
 
 Thanks to the [great work](https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/251) of [Eduardo Beltrame (Munfred)](https://github.com/Munfred) and [Robbie D (microchipster)](https://github.com/microchipster), the playbook now supports bridging to [Google Hangouts](https://hangouts.google.com/) via the [mautrix-hangouts](https://mau.dev/tulir/mautrix-hangouts) bridge.
 

README.md

@@ -46,6 +46,8 @@ Using this playbook, you can get the following services configured on your serve
 
 - (optional) the [matrix-appservice-discord](https://github.com/Half-Shot/matrix-appservice-discord) bridge for bridging your Matrix server to [Discord](https://discordapp.com/)
 
+- (optional) the [matrix-appservice-slack](https://github.com/matrix-org/matrix-appservice-slack) bridge for bridging your Matrix server to [Slack](https://slack.com/)
+
 - (optional) [Email2Matrix](https://github.com/devture/email2matrix) for relaying email messages to Matrix rooms
 
 - (optional) [Dimension](https://github.com/turt2live/matrix-dimension), an open source integrations manager for matrix clients
@@ -132,6 +134,8 @@ This playbook sets up your server using the following Docker images:
 
 - [halfshot/matrix-appservice-discord](https://hub.docker.com/r/halfshot/matrix-appservice-discord) - the [matrix-appservice-discord](https://github.com/Half-Shot/matrix-appservice-discord) bridge to [Discord](https://discordapp.com/) (optional)
 
+- [cadair/matrix-appservice-slack](https://hub.docker.com/r/cadair/matrix-appservice-slack) - the [matrix-appservice-slack](https://github.com/matrix-org/matrix-appservice-slack) bridge to [Slack](https://slack.com/) (optional)
+
 - [turt2live/matrix-dimension](https://hub.docker.com/r/turt2live/matrix-dimension) - the [Dimension](https://dimension.t2bot.io/) integrations manager (optional)