Fix bridge no longer POSTing username and avatar (slack) (#536)
Fix bridge no longer POSTing username and avatar (slack) (#536)

* Fixed pointer/reference issue in populateUsers. [#536]

* Accepted codestyle suggestion.

* Update bridge/slack/helpers.go

Co-Authored-By: patcon <6237a18c795eda4a8394817425a4e621d4a3c614@gmail.com>

* Update helpers.go

42wim/matterbridge,42wim/matterbridge