Drop python3.6 support

Author: isra17

.github/workflows/ci.yml

@@ -18,7 +18,6 @@ jobs:
         os:
           - ubuntu-latest
         toxenv:
-          - py36,report,codecov
           - py37,report,codecov
           - py38,report,codecov
           - py39,report,codecov

tests/test_make.py

@@ -81,7 +81,7 @@ def fixture_from_dict(
     id_to_value: t.Mapping[
         str, t.Callable[[marshmallow.Schema, t.Dict[t.Any, t.Any], t.Any], None]
     ],
-) -> _pytest.fixtures._FixtureFunction:
+) -> _pytest.fixtures.FixtureFunction:
     """
     Create fixture parametrized to yield each value and labeled with the
     corresponding ID.

tox.ini

@@ -5,13 +5,12 @@ envlist =
     clean,
     check,
     doc,
-    {py36,py37,py38,py39,pypy3},
+    {py37,py38,py39,pypy3},
     report
 
 [testenv]
 basepython =
     pypy3: {env:TOXPYTHON:pypy3}
-    py36: {env:TOXPYTHON:python3.6}
     py37: {env:TOXPYTHON:python3.7}
     py38: {env:TOXPYTHON:python3.8}
     py39: {env:TOXPYTHON:python3.9}