Allow text-1.2 (#50)

Hi @IreneKnapp, this allows text-1.2.  It'd be good to put this up on Hackage soon so that anyone trying to use text-1.2 won't run into problems.

I'm not sure if I'm up to date with all the other features since the previous release in April.  I think some PRs have gone in, but I guess those are not released to Hackage yet.  I only added what I changed into changelog.