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Update build for release

Merge pull request purescript-deprecated#36 from purescript/unit

Add Unit handling

Merge pull request purescript-deprecated#35 from purescript/0.9-updates

Updates for PureScript 0.9

Merge pull request purescript-deprecated#24 from hdgarrood/add-show-s…

…ignature

Add showSignature and showDataConstructor

Merge pull request purescript-deprecated#23 from purescript/fix-deriv…

…e-comment

Fix the doc comment about deriving instances

Merge feature branches

Merge pull request purescript-deprecated#17 from aspidites/fix-warnings

Fix warnings

Merge pull request purescript-deprecated#16 from zudov/fixed-eq

Add missing equality test on SString

Merge pull request purescript-deprecated#15 from felixSchl/feature/su…

…pport-prim-char

Add support for `Prim.Char`