fix declared language extensions

breve.cabal

@@ -29,7 +29,9 @@ executable breve
   other-modules:      Application, Views, Breve.Settings,
                       Breve.Generator, Breve.UrlTable,
                       Paths_breve
-  other-extensions:  OverloadedStrings
+  default-extensions: OverloadedStrings
+  other-extensions:   RecordWildCards, DeriveGeneric,
+                      DataKinds, KindSignatures, TypeOperators
   build-depends:      base >=4.8 && <5.0,
                       warp, warp-tls, tls, blaze-html, blaze-markup,
                       servant-server, servant, servant-blaze,

src/Breve/Settings.hs

@@ -1,5 +1,3 @@
-{-# LANGUAGE OverloadedStrings #-}
-
 {-|
 This module defines the Breve configuration
 parser and application settings.

src/Main.hs

@@ -1,4 +1,3 @@
-{-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE RecordWildCards #-}
 
 {-|

src/Views.hs

@@ -1,5 +1,3 @@
-{-# LANGUAGE OverloadedStrings #-}
-
 {-|
 This module contains the HTML pages used by the
 web application. These are all obtained by filling