Travis: use current HEAD of servant-server

.travis.yml

@@ -5,8 +5,10 @@ ghc:
 
 before_install:
   - git clone https://github.com/haskell-servant/servant.git
+  - git clone https://github.com/haskell-servant/servant-server.git
   - cabal sandbox init
   - cabal sandbox add-source servant/
+  - cabal sandbox add-source servant-server/
 
 notifications:
   irc:

test/Servant/ClientSpec.hs

@@ -246,3 +246,4 @@ pathGen = listOf $ elements $
   filter (not . (`elem` "?%[]/#")) $
   filter isPrint $
   map chr [0..127]
+