Fix build on GHC 7.8

src/Stack/Fetch.hs

@@ -60,7 +60,7 @@ import qualified Data.List.NonEmpty             as NE
 import           Data.Map                       (Map)
 import qualified Data.Map                       as Map
 import           Data.Maybe                     (maybeToList, catMaybes)
-import           Data.Monoid                    ((<>))
+import           Data.Monoid
 import           Data.Set                       (Set)
 import qualified Data.Set                       as Set
 import           Data.String                    (fromString)

stack-7.8.yaml

@@ -46,3 +46,4 @@ extra-deps:
 - http-client-tls-0.2.4
 - connection-0.2.5
 - regex-applicative-text-0.1.0.1
+- monad-unlift-0.1.1.0