Travis python 3.x environment does not install packages from requirem…

…ents.txt?

.travis.yml

@@ -13,6 +13,7 @@ install:
 - pip install nose nose-parameterized
 - pip install wheel
 - pip install twine
+- pip install -r requirements.txt
 script:
 - coverage run --source=oandapyV20 setup.py test
 after_success: