fixing travis for python 2.7 build

.travis.yml

@@ -8,9 +8,9 @@ python:
   - "3.5"
   - "3.6"
   - "3.6-dev"
-install:
-  - pip install --upgrade pipenv
-  - pipenv install --dev --ignore-pipfile
+install: "make"
+script:
+    - make test
 before_script: flake8
 before_install:
   - sudo apt-get install -y python-pip

Makefile

@@ -22,3 +22,10 @@ clean-pyc:
 
 install: clean
 	python setup.py install
+	
+init:
+    pip install pipenv
+    pipenv install --dev
+
+test:
+    pipenv run py.test tests