Add support for `deepseq-1.4.0.0` (addresses #100)
Add support for `deepseq-1.4.0.0` (addresses #100)

The default method implementation has changed in `deepseq-1.4.0.0`.
(see haskell/deepseq#1 for details). This simply sets the `rnf`
implementation explicitly to avoid relying on the default method's
semantics.

aloiscochard/text,alexliew/text,text-utf8/text,text-utf8/text,beni55/text,spencerjanssen/text,23Skidoo/text,spencerjanssen/text,23Skidoo/text,bgamari/text,aloiscochard/text,bos/text,aloiscochard/text,spencerjanssen/text,hvr/text,hvr/text,spencerjanssen/text,alexliew/text,aloiscochard/text,23Skidoo/text,beni55/text,bos/text,bos/text,hvr/text,bgamari/text,bgamari/text,alexliew/text,bgamari/text,beni55/text,23Skidoo/text,alexliew/text,beni55/text,hvr/text,text-utf8/text,bos/text,text-utf8/text