Update main.yml

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

@@ -3,7 +3,7 @@
 
 matrix_appservice_slack_enabled: true
 
-matrix_appservice_slack_docker_image: "matrixdotorg/matrix-appservice-slack"
+matrix_appservice_slack_docker_image: "matrixdotorg/matrix-appservice-slack:release-1.5.0"
 matrix_appservice_slack_docker_image_force_pull: "{{ matrix_appservice_slack_docker_image.endswith(':latest') }}"
 
 matrix_appservice_slack_base_path: "{{ matrix_base_data_path }}/appservice-slack"