Cabal revisions of clash-prelude-0.8.1

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

 Name:                 clash-prelude
 Version:              0.8.1
+x-revision: 1
 Synopsis:             CAES Language for Synchronous Hardware - Prelude library
 Description:
   CλaSH (pronounced ‘clash’) is a functional hardware description language that
                       ghc-typelits-natnormalise >= 0.3,
                       lens                      >= 4.9,
                       QuickCheck                >= 2.7 && <2.9,
-                      singletons                >= 1.0,
+                      singletons                >= 1.0 && <2.0,
                       template-haskell          >= 2.9.0.0,
                       th-lift                   >= 0.5.6