Include a default language.

Author: Thomas M. DuBuisson

pureMD5.cabal

@@ -21,6 +21,7 @@ flag test
 Library
   Build-Depends: base == 4.*, bytestring >= 0.9, binary >= 0.4.0, cereal >= 0.2, crypto-api, tagged
   ghc-options:	-O2 -funfolding-use-threshold66 -funfolding-creation-threshold66 -funbox-strict-fields
+  default-language: Haskell2010
   hs-source-dirs:
   exposed-modules: Data.Digest.Pure.MD5
   if arch(i386) || arch(x86_64)