Move away from tox to make.

Make is more generalist and I can use it to extend shit later.
I don't exacccctly get the point of tox when make is right there?

Makefile

@@ -0,0 +1,22 @@
+.DEFAULT_GOAL := help
+.PHONY: coverage deps help lint push test
+
+coverage:  ## Run tests with coverage
+	coverage erase
+	coverage run --include=warren/* -m pytest -ra
+	coverage report -m
+
+deps:  ## Install dependencies
+	pip install black coverage flake8 mccabe mypy pylint pytest tox
+
+lint:  ## Lint and static-check
+	black warren
+	flake8 warren
+	pylint warren
+	mypy warren
+
+push:  ## Push code with tags
+	git push && git push --tags
+
+test:  ## Run tests
+	pytest -ra

tox.ini

@@ -1,21 +0,0 @@
-[tox]
-isolated_build = True
-envlist = py37,py38,py39
-
-[testenv]
-deps =
-    black
-    coverage
-    flake8
-    mccabe
-    mypy
-    pylint
-    pytest
-commands =
-    black warren
-    flake8 warren
-    pylint warren
-    mypy warren
-    coverage erase
-    coverage run --include=warren/* -m pytest -ra
-    coverage report -m