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.