Fix Makefile

Author: vmalloc

Makefile

@@ -9,11 +9,8 @@ doc: env
 env: .env/.up-to-date
 
 
-.env/.up-to-date: setup.py Makefile test_requirements.txt
+.env/.up-to-date: setup.py Makefile setup.cfg
 	virtualenv --no-site-packages .env
-	.env/bin/pip install -e .
-	.env/bin/pip install -r ./*.egg-info/requires.txt || true
-	.env/bin/pip install -r ./docs/requirements.txt
-	.env/bin/pip install -r test_requirements.txt
+	.env/bin/pip install -e .[testing]
 	touch $@