Remove haddock argument in travis config.

.travis.yml

@@ -28,7 +28,7 @@ before_install:
 # This line does all of the work: installs GHC if necessary, build the library,
 # executables, and test suites, and runs the test suites. --no-terminal works
 # around some quirks in Travis's terminal implementation.
-script: stack $ARGS --no-terminal --install-ghc test --haddock
+script: stack $ARGS --no-terminal --install-ghc test
 
 # Caching so the next build will be fast too.
 cache: