Remove obsolete tox envs

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 minversion = 3.5.3
-envlist = py{37,38,39,310}, linting, norewrite
+envlist = py{37,38,39,310}, norewrite
 
 [testenv]
 passenv = USER USERNAME
@@ -14,18 +14,6 @@ commands =
 commands =
     pytest tests --assert=plain
 
-[testenv:linting]
-usedevelop = True
-extras = dev
-basepython = python3.6
-commands = pre-commit run --all-files --show-diff-on-failure
-
-[testenv:mypy]
-skip_install = true
-deps =
-    mypy==0.800
-commands = mypy {posargs:src tests}
-
 [pytest]
 addopts = -r a
 asyncio_mode = auto