We don't need MANIFEST.in thanks to setuptools_scm anymore

MANIFEST.in

@@ -1,6 +0,0 @@
-include *.md *.txt *.ini LICENSE .pre-commit-config.yaml pyproject.toml
-exclude src/argon2/_ffi.py .gitmodules extras/libargon2/.git *.yml
-graft tests
-graft .github
-recursive-exclude tests *.pyc
-graft extras

tox.ini

@@ -11,13 +11,13 @@ python =
     3.6: py36
     3.7: py37
     3.8: py38
-    3.9: py39, manifest
+    3.9: py39
     3.10: py310, cogCheck
     pypy-3: pypy3
 
 
 [tox]
-envlist = pre-commit,cogCheck,cog,py36,py37,py38,py39,py310,pypy3,system-argon2,manifest,pypi-description
+envlist = pre-commit,cogCheck,cog,py36,py37,py38,py39,py310,pypy3,system-argon2,pypi-description
 isolated_build = true
 
 
@@ -61,13 +61,6 @@ commands =
     python -m pytest {posargs}
 
 
-[testenv:manifest]
-description = Ensure MANIFEST.in is up to date.
-deps = check-manifest
-skip_install = true
-commands = check-manifest
-
-
 [testenv:pypi-description]
 description = Ensure README.rst renders on PyPI.
 skip_install = true