Update yesod-test cabal file for distribution

Hackage is now requiring a higher cabal file version, and with that comes a requirement to specify the language of each module

yesod-test/yesod-test.cabal

@@ -7,13 +7,14 @@ maintainer:         Michael Snoyman, Greg Weber, Nubis <nubis@woobiz.com.ar>
 synopsis:           integration testing for WAI/Yesod Applications
 category:           Web, Yesod, Testing
 stability:          Experimental
-cabal-version:      >= 1.8
+cabal-version:      >= 1.10
 build-type:         Simple
 homepage:           http://www.yesodweb.com
 description:     API docs and the README are available at <http://www.stackage.org/package/yesod-test>
 extra-source-files: README.md, LICENSE, test/main.hs, ChangeLog.md
 
 library
+    default-language: Haskell2010
     build-depends:   HUnit                     >= 1.2
                    , aeson
                    , attoparsec                >= 0.10
@@ -47,6 +48,7 @@ library
     ghc-options:  -Wall
 
 test-suite test
+    default-language: Haskell2010
     type: exitcode-stdio-1.0
     main-is: main.hs
     hs-source-dirs: test