Add record to Req type

This is needed for servant-js to know whether to call JSON.stringify()
on the request body or just send it raw.

servant-foreign/servant-foreign.cabal

@@ -1,5 +1,5 @@
 name:                servant-foreign
-version:             0.11.1
+version:             0.11.2
 x-revision:          3
 synopsis:            Helpers for generating clients for servant APIs in any programming language
 description:

servant-foreign/src/Servant/Foreign.hs

@@ -21,6 +21,7 @@ module Servant.Foreign
   , reqMethod
   , reqHeaders
   , reqBody
+  , reqBodyIsJSON
   , reqReturnType
   , reqFuncName
   , path

servant-foreign/src/Servant/Foreign/Internal.hs

@@ -130,13 +130,14 @@ data Req f = Req
   , _reqBody       :: Maybe f
   , _reqReturnType :: Maybe f
   , _reqFuncName   :: FunctionName
+  , _reqBodyIsJSON :: Bool
   }
   deriving (Data, Eq, Show, Typeable)
 
 makeLenses ''Req
 
 defReq :: Req ftype
-defReq = Req defUrl "GET" [] Nothing Nothing (FunctionName [])
+defReq = Req defUrl "GET" [] Nothing Nothing (FunctionName []) True
 
 -- | 'HasForeignType' maps Haskell types with types in the target
 -- language of your backend. For example, let's say you're