yesod-1.4.3: ChangeLog.md

## 1.4.3

* Switch to `Data.Yaml.Config`

## 1.4.2

* Do not parse string environment variables into numbers/booleans [#1061](https://github.com/yesodweb/yesod/issues/1061)

## 1.4.1

Provide the `Yesod.Default.Config2` module, for use by newer scaffoldings.