Allow Travis to build tags
Allow Travis to build tags

Travis wasn't auto-deploying tags because it wasn't building tags at all.
Travis sees tags as branches, so by allowing _branches_ that look like a tag,
Travis should build our tags as well, which will allow it to deploy them :+1:

jekyll/jekyll-sitemap,kevinoid/jekyll-sitemap,kevinoid/jekyll-sitemap,jekyll/jekyll-sitemap