Use pipenv on Travis CI.

.travis.yml

@@ -7,12 +7,11 @@ python:
   - "3.6"
 
 install:
-    - pip install --only-binary=numpy,scipy -r requirements/deploy.txt
-    - pip install -r requirements/dev.txt
+  - pip install pipenv
+  - pipenv install --dev
 
 script:
-  - export PYTHONPATH=.
-  - py.test --cov=pytac --pep8 --flakes
+  - pipenv run python -m pytest --cov=pytac --pep8 --flakes
 
 after_success:
   - coveralls

Pipfile

@@ -0,0 +1,29 @@
+[[source]]
+
+url = "https://pypi.python.org/simple"
+verify_ssl = true
+name = "pypi"
+
+
+[dev-packages]
+
+pytest = "*"
+pytest-cov = "*"
+python-coveralls = "*"
+mock = "*"
+pytest-flakes = "*"
+"pytest-pep8" = "*"
+bpython = "*"
+
+
+[packages]
+
+numpy = "*"
+scipy = "*"
+sphinx = "*"
+sphinx-rtd-theme = "*"
+
+
+[requires]
+
+python_version = "2.7"