Move package metadata to setup.cfg

Instead of relying on setup.py, use setup.cfg.

Dev/doc requirements have been moved there as well, under the `doc` and
`dev` extras.

1 files changed, 1 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index c94363c..811d72a 100644
--- a/Makefile
+++ b/Makefile
@@ -27,7 +27,7 @@ clean:
 
 update:
 	pip install --upgrade pip setuptools
-	pip install --upgrade -r requirements_dev.txt
+	pip install --upgrade -e .[dev,doc]
 	pip freeze