Fix Github conflict with Scrum for Trello

When adding a card to Trello while using the "Scrum for Trello" Chrome extension, the issue type being in parenthesis could conflict with the points feature in "Scrum for Trello."

This bug may or may not be fixed with "Scrum for Trello" but my team is still seeing conflicts, and this is a simple enough fix for bug2trello.