Small improvements (#92)

* add a stack.yaml file
* unsafeRunInterpreterWithArgsLibdir's documentation was using incorrect haddock style tags

Author: gelisam

src/Language/Haskell/Interpreter/Unsafe.hs

@@ -35,7 +35,7 @@ unsafeRunInterpreterWithArgs = runInterpreterWithArgs
 --   containers, etc.) can be found. This allows you to run hint on
 --   a machine in which GHC is not installed.
 --
---   A typical libdir value could be "/usr/lib/ghc-8.0.1/ghc-8.0.1".
+--   A typical libdir value could be @/usr/lib/ghc-8.0.1/ghc-8.0.1@.
 unsafeRunInterpreterWithArgsLibdir :: (MonadIO m, MonadMask m)
                                    => [String]
                                    -> String

stack.yaml

@@ -0,0 +1,5 @@
+resolver: lts-13.18
+packages:
+- .
+extra-deps:
+- exceptions-0.10.0