Update matrix-appservice-irc to 0.16.0

Note the potential breaking change

Resolves #474

CHANGELOG.md

@@ -1,3 +1,16 @@
+# 2020-04-28
+
+## Newer IRC bridge (with potential breaking change)
+
+This upgrades matrix-appservice-irc from 0.14.1 to 0.16.0.  Upstream
+made a change to how you define manual mappings.  If you added a
+`mapping` to your configuration, you will need to update it accoring
+to the [upstream
+instructions](https://github.com/matrix-org/matrix-appservice-irc/blob/master/CHANGELOG.md#0150-2020-02-05).
+If you did not include `mappings` in your configuration for IRC, no
+change is necessary.  `mappings` is not part of the default
+configuration.
+
 # 2020-04-23
 
 ## Slack bridging support

roles/matrix-bridge-appservice-irc/defaults/main.yml

@@ -3,7 +3,7 @@
 
 matrix_appservice_irc_enabled: true
 
-matrix_appservice_irc_docker_image: "matrixdotorg/matrix-appservice-irc:release-0.14.1"
+matrix_appservice_irc_docker_image: "matrixdotorg/matrix-appservice-irc:release-0.16.0"
 matrix_appservice_irc_docker_image_force_pull: "{{ matrix_appservice_irc_docker_image.endswith(':latest') }}"
 
 matrix_appservice_irc_base_path: "{{ matrix_base_data_path }}/appservice-irc"