Enable build warnings

Main.hs

@@ -81,7 +81,7 @@ parsePackageName :: Opts.Parser PackageName
 parsePackageName = PackageName <$>
     Opts.argument Opts.str (Opts.metavar "PACKAGE")
 
-newtype PackageSpec = PackageSpec { unPackageSpec :: Aeson.Object }
+newtype PackageSpec = PackageSpec { _unPackageSpec :: Aeson.Object }
   deriving newtype (FromJSON, ToJSON, Show, Semigroup, Monoid)
 
 parsePackageSpec :: Opts.Parser PackageSpec
@@ -422,7 +422,7 @@ cmdUpdate = \case
       versionsSpec' <- forWithKeyM versionsSpec $
         \packageName packageSpec -> do
           putStrLn $ "Package: " <> unPackageName packageName
-          updatePackageSpec packageSpec
+          updatePackageSpec =<< completePackageSpec packageSpec
 
       setVersionsSpec $ VersionsSpec versionsSpec'
 

package.yaml

@@ -1,5 +1,9 @@
 name: niv
 
+ghc-options:
+    - -Wall
+    - -Werror
+
 executable:
     source-dirs: . # remove when https://github.com/nmattia/snack/pull/96 is merged
     main: Main.hs