BLD: doc-build not updating
https://travis-ci.org/pandas-dev/pandas/jobs/180943536
```
remote: Invalid username or password.
fatal: Authentication failed for 'https://31310115c22fa14cc890af304528622f68104fb8@github.com/pandas-docs/pandas-docs-travis/'
```

this is after I restored the original credentials.........

cc @wesm 
cc @jorisvandenbossche 