Fix doc link

Author: alexcrichton

.travis.yml

@@ -7,7 +7,7 @@ script:
 after_success: |
   [ $TRAVIS_BRANCH = master ] &&
   [ $TRAVIS_PULL_REQUEST = false ] &&
-  echo '<meta http-equiv=refresh content=0;url=rustc-serialize/index.html>' > target/doc/index.html &&
+  echo '<meta http-equiv=refresh content=0;url=/rustc-serialize/rustc_serialize/index.html>' > target/doc/index.html &&
   pip install ghp-import --user $USER &&
   $HOME/.local/bin/ghp-import -n target/doc &&
   git push -qf https://${TOKEN}@github.com/${TRAVIS_REPO_SLUG}.git gh-pages