Changelog for blaze-markup-0.6.1.0

- 0.6.1.0 * Add the `null` query to Text.Blaze.Internal. - 0.6.0.0 * Add the operator (!?) for nicely setting conditional attributes - 0.5.2.0 * Provide ToHtml and ToValue instances for Int32, Int64, Word, Word32, and Word64