0.006   2016-01-01
        * Update changelog for 0.005 (5.10.1 tested successfully).
        * Add license metadata. Thanks, Manwar!
        * Rephrase croak message for is_formatref on 5.6.

0.005   2015-12-28
        * Support for 5.10. (Tested on 5.10.1)
        * Support for 5.8. (Tested on 5.8.9)
        * Support for 5.6, except for is_formatref. (Tested on 5.6.2)
        * Support older Test::More versions.
        * Provide metadata to direct people to Github instead of RT.
          (Thanks, Graham Ollis!)
        * Clarify Readonly, tied variables, and magic.
        * Cleaned up docs a bit.

0.004   2015-12-18
        * Add is_refref() function!
        * Mention and compare to Scalar::Util::reftype.
        * Add benchmark results, including against reftype.
        * Add a note about the nature of playing with op trees, sort of.
        * Add a note on what functions from reftype() are not available.
        * Clarify how bad overloading is. No, it's not duck-typing either.

0.003   2015-12-17
        * Clarify overloading approach. Sorry, everyone!
        * Document :all option.

0.002   2015-12-05
        * Ugh PAUSE. Thanks, Graham Barr.

0.001   2015-12-04
        * First version