FIX: deprecation - `usernames` is now `recipients`

FIX: deprecation - usernames is now recipients

diff --git a/app/assets/javascripts/select-kit/addon/components/composer-actions.js b/app/assets/javascripts/select-kit/addon/components/composer-actions.js
index 287b752..0fb5fdd 100644
--- a/app/assets/javascripts/select-kit/addon/components/composer-actions.js
+++ b/app/assets/javascripts/select-kit/addon/components/composer-actions.js
@@ -334,7 +334,7 @@ export default DropdownSelectBoxComponent.extend({
     }
 
     options.action = PRIVATE_MESSAGE;
-    options.usernames = usernames;
+    options.recipients = usernames;
     options.archetypeId = "private_message";
     options.skipDraftCheck = true;
 

GitHub sha: 6ba1c641