Switch /mentorvolunteer to /mentor-volunteer

Author: AllenAnthes

pybot/endpoints/slack/commands.py

@@ -27,7 +27,7 @@ def create_endpoints(plugin: SlackPlugin):
     plugin.on_command("/ticket", slash_ticket, wait=False)
     plugin.on_command("/roll", slash_roll, wait=False)
     plugin.on_command("/mentor", slash_mentor, wait=False)
-    plugin.on_command("/mentorvolunteer", slash_mentor_volunteer, wait=False)
+    plugin.on_command("/mentor-volunteer", slash_mentor_volunteer, wait=False)
 
 
 @catch_command_slack_error