Small improvements (#131)

* Add missing requirements

* Fix test command

Makefile

@@ -4,7 +4,7 @@ help:
 	@echo "clean-build - remove build artifacts"
 	@echo "clean-pyc - remove Python file artifacts"
 	@echo "lint - check style with flake8"
-	@echo "test - run tests quickly with the default Python"
+	@echo "test - run tests"
 	@echo "test-all - run tests on every Python version with tox"
 	@echo "coverage - check code coverage quickly with the default Python"
 	@echo "docs - generate Sphinx HTML documentation, including API docs"
@@ -28,7 +28,7 @@ lint:
 	flake8 closeio tests
 
 test:
-	python setup.py test
+	pytest tests
 
 test-all:
 	tox

requirements-dev.txt

@@ -1,5 +1,7 @@
 -e .
 coverage>=4.5.1
+django==2.0.9
+flake8==3.6.0
 isort>=4.3.4
 pytest>=3.6.2
 pytest-django>=3.3.2