upgrade type signature to allow MonadThrow when exceptions 0.4 is installed
upgrade type signature to allow MonadThrow when exceptions 0.4 is
installed

ddssff/lens,danidiaz/lens,cchalmers/lens,Gabriel439/lens,rpglover64/lens,Icelandjack/lens,cdepillabout/lens,Fuuzetsu/lens,omefire/lens,timjb/lens