Release v2.6

More Discord improvements

• Don’t post leaderboards if nothing has changed compared to the last one.
• Instead of mentioning the author of a leaderboard entry, the leaderboards links to the original message, making it a lot easier to add an reaction.
• Don’t consider all reactions as valid reactions. (For now we only consider the reaction configured in the settings)
• Fix card-history issue when people have been upvoting.
• Add link to original Discord message within card content when card was created by reaching a reaction threshold.