[CAMEL-14388] Camel-Slack: Remove username from SlackMessage, since the API doesn't return it anymore

• Type: Task
• Status: Resolved
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 3.0.0
• Fix Version/s: 3.1.0
• Component/s: camel-slack
• Estimated Complexity: Unknown
• Assignee: Andrea Cosentino
• Reporter: Andrea Cosentino
• Created: 10/Jan/20 08:32
• Updated: 10/Jan/20 08:38
• Resolved: 10/Jan/20 08:38