Fix Travis error.

Author: skytreader

.travis.yml

@@ -1,7 +1,7 @@
 language: python
 python:
     - "3.4"
-install: "pip install -r python/requirements.txt"
+install: "pip install -r requirements.txt"
 script: "nosetests --with-xcoverage"
 after_success: "COVERALLS_REPO_TOKEN=$coveralls_token coveralls"
 after_failure: "COVERALLS_REPO_TOKEN=$coveralls_token coveralls"