Cleanup makefile

{{cookiecutter.project_slug}}/Makefile

@@ -7,8 +7,8 @@ all: install
 install: 
 	pip install .
 
-install-dev: dependencies-dev
-	pip install -e .
+install-dev:
+	pip install -e ".[dev]"
 
 venv:
 	python3 -m venv venv
@@ -27,15 +27,9 @@ test-loop:
 	py.test tests
 	ptw --ext=.py,.pyx --ignore=doc tests
 
-dependencies:
-	pip install -Ur requirements.txt
-
-dependencies-dev:
-	pip install -Ur requirements-dev.txt
-
 yapf:
 	yapf -i -r $(PKGNAME)
 	yapf -i -r tests
 	yapf -i setup.py
 
-.PHONY: all clean install install-dev venv test test-cov test-loop dependencies dependencies-dev yapf
+.PHONY: all clean install install-dev venv test test-cov test-loop yapf