Merge pull request #2854 from Xaelias/slack/2020_08_02/add_blocks_support

slack] Add support for blocks

app/models/agents/slack_agent.rb

@@ -1,7 +1,7 @@
 module Agents
   class SlackAgent < Agent
     DEFAULT_USERNAME = 'Huginn'
-    ALLOWED_PARAMS = ['channel', 'username', 'unfurl_links', 'attachments']
+    ALLOWED_PARAMS = ['channel', 'username', 'unfurl_links', 'attachments', 'blocks']
 
     can_dry_run!
     cannot_be_scheduled!