Cabal revisions of HTF-0.15.0.0

Hackage metadata revisions edit the .cabal file after upload; each diff below is one revision.

 Cabal-Version:    2.0 Name:             HTF Version:          0.15.0.0+x-revision: 1 License:          LGPL-2.1 License-File:     LICENSE Copyright:        (c) 2005-2015 Stefan Wehr                     base >= 4.10 && < 5,                     cpphs >= 1.19,                     directory >= 1.0,-                    mtl >= 1.1,+                    mtl >= 1.1 && < 2.3,                     old-time >= 1.0,                     random >= 1.0,                     text >= 0.11,                     directory >= 1.0,                     lifted-base >= 0.1,                     monad-control >= 0.3,-                    mtl >= 1.1,+                    mtl >= 1.1 && < 2.3,                     old-time >= 1.0,                     pretty >= 1.0,                     process >= 1.0,