Add -Werror, fix unused import warnings

- Add -Werror to ghc-options for both library and test suite
- Remove unused Data.Maybe import from Internal.hs
- Remove unused Data.Int and Data.Text imports from test files

orville-sqlite.cabal

@@ -34,7 +34,7 @@ library
     , text
     , bytestring
   default-language: Haskell2010
-  ghc-options: -Wall
+  ghc-options: -Wall -Werror
 
 test-suite spec
   type: exitcode-stdio-1.0
@@ -56,3 +56,4 @@ test-suite spec
     , hspec
     , text
   default-language: Haskell2010
+  ghc-options: -Wall -Werror

src/Orville/SQLite/Internal.hs

@@ -5,7 +5,6 @@ module Orville.SQLite.Internal (
 ) where
 
 import Control.Monad (forM)
-import Data.Maybe (fromMaybe)
 import qualified Data.Text as T
 import qualified Database.SQLite3 as SQLite3
 import Database.SQLite3.Direct (columnCount)

test/Test/AutoMigration.hs

@@ -7,7 +7,6 @@ module Test.AutoMigration where
 
 import Control.Exception (SomeException, try)
 import Control.Monad.IO.Class (liftIO)
-import Data.Int (Int64)
 import Test.Hspec
 
 import Orville.SQLite

test/Test/EntityOperations.hs

@@ -4,8 +4,6 @@
 module Test.EntityOperations where
 
 import Control.Monad.IO.Class (liftIO)
-import Data.Int (Int64)
-import Data.Text (Text)
 import Test.Hspec
 
 import Orville.SQLite

test/Test/SqlMarshaller.hs

@@ -4,7 +4,6 @@
 
 module Test.SqlMarshaller where
 
-import Data.Int (Int64)
 import qualified Data.Text as T
 import Test.Hspec