Switch to running tests using pytest

Author: asherf

requirements.txt

@@ -6,4 +6,6 @@ pip-prometheus>=1.2.1
 mock
 mysqlclient
 psycopg2
+pytest<5.0
+pytest-django
 python-memcached

setup.cfg

@@ -0,0 +1,5 @@
+[aliases]
+test=pytest
+
+[tool:pytest]
+addopts = --ignore django_prometheus/tests/end2end

setup.py

@@ -22,6 +22,8 @@
     packages=find_packages(),
     test_suite="django_prometheus.tests",
     long_description=LONG_DESCRIPTION,
+    tests_require=['pytest', 'pytest-django'],
+    setup_requires=["pytest-runner"],
     install_requires=[
         "prometheus-client>=0.7",
     ],