Minor fix in atom

Yesod/Helpers/AtomFeed.hs

@@ -47,13 +47,13 @@ data AtomFeedEntry url = AtomFeedEntry
     , atomEntryContent :: Html ()
     }
 
-xmlns :: AtomFeed url -> Html ()
-xmlns _ = preEscapedString "http://www.w3.org/2005/Atom"
+xmlns :: Html ()
+xmlns = preEscapedString "http://www.w3.org/2005/Atom"
 
 template :: AtomFeed url -> Hamlet url
 template arg = [$xhamlet|
 <?xml version="1.0" encoding="utf-8"?>
-%feed!xmlns=$xmlns.arg$
+%feed!xmlns=$xmlns$
     %title $string.atomTitle.arg$
     %link!rel=self!href=@atomLinkSelf.arg@
     %link!href=@atomLinkHome.arg@

yesod.cabal

@@ -32,7 +32,7 @@ library
                      template-haskell >= 2.4 && < 2.5,
                      web-routes >= 0.22 && < 0.23,
                      web-routes-quasi >= 0.5 && < 0.6,
-                     hamlet >= 0.3.1 && < 0.4,
+                     hamlet >= 0.4.0 && < 0.5,
                      transformers >= 0.2 && < 0.3,
                      clientsession >= 0.4.0 && < 0.5,
                      pureMD5 >= 1.1.0.0 && < 1.2,