Update Makefile

Author: tmathern

Makefile

@@ -3,8 +3,7 @@
 # Start from clean env: Delete `.venv`, then `python3 -m venv .venv`
 # Pre-requisite: Python virtual environment is active (source .venv/bin/activate)
 build-python: release
-	python3 -m venv .venv
-	source .venv/bin/activate
-	python3 -m pip install -r requirements.txt
-	python3 -m pip install -r requirements-dev.txt
-	maturin develop
+  python3 -m venv .venv
+  source .venv/bin/activate
+  python3 -m pip install -r requirements.txt
+  maturin develop