build: need to skip cleanup so that travis can deploy docs

Author: davidjoy

.travis.yml

@@ -10,7 +10,7 @@ after_success:
   - codecov
 deploy:
   provider: pages
-  skip_cleanup: false
+  skip_cleanup: true
   github_token: $GH_TOKEN
   keep_history: true
   local_dir: ./docs/api/@edx/frontend-platform/1.0.0-semantically-released