Fix redirection

Author: kngwyu

ci/travis/deploy.sh

@@ -1,7 +1,7 @@
 #!/bin/sh
 
 cargo doc --all-features --no-deps &&
-echo "<meta http-equiv=refresh content=0;url=os_balloon/index.html>" > target/doc/index.html &&
+echo "<meta http-equiv=refresh content=0;url=numpy/index.html>" > target/doc/index.html &&
 git clone https://github.com/davisp/ghp-import.git &&
 ./ghp-import/ghp_import.py -n \
                            -p \