Changelog for text-and-plots-0.2.1.0

- 0.2.1.0 * Bumped base dependency. - 0.2.0.0 * Using the Text.DocL.Javascript module instead of aeson (since not everything we want to ship to C3.js is JSON encodable). - 0.1.1.0 * Bumped blaze-html dependency to <0.9.