Support GHC-7.0.4; add GHC-8.8.1 travis job. #22
Merged
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This will help with quchen/prettyprinter#74, if we go for GHC-7.0 support too.
Even without, this change is quite small. I cannot find the reasoning why GHC-7.2/7.0 support was dropped. At least the CPP in the code weren't cleaned up, so I restore it.
Note: I also made UnkindPartition/ansi-terminal#82, so we could add Safe Haskell annotations to
ansi-wl-pprint
soon/later.