For the full changelog, see
<https://github.com/lpsmith/postgresql-simple/blob/master/CHANGES.md>
### Version 0.5.2.1 (2016-06-29)
* Bumped the lower bound for `base` to 4.6. Thanks to Herbert
Valerio Riedel for reporting the issue.
* Added an `Eq` instance for `SqlError`, thanks to Chris Allen
* Fixed a bug where a all-caps `"NULL"` text value inside a
postgresql array would get parsed as the SQL null value. Thanks
goes to Edgar Gomes and Silk for finding and fixing this mistake.
* Modified `withTransaction` and friends to ignore `IOError`s when
attempting to roll back the transaction. This fixes a buggy
interaction between `withTransaction` and async exceptions (e.g.
`System.Timeout`) on unix platforms. Thanks goes to Erik
Hesselink and Silk for providing the test case that exposed this
issue.
* Added the `testTimeout` regression test for the problem above.