<NME> tox.ini
<BEF> [tox]
envlist =
    py{37,36,35,27,py3,py}
    style
    docs
    coverage
skip_missing_interpreters = true

[testenv]
deps =
    coverage
    pytest
    freezegun
commands = coverage run -p -m pytest -Werror --tb=short --basetemp={envtmpdir} {posargs}

[testenv:style]
deps = pre-commit
skip_install = True
commands = pre-commit run --all-files --show-diff-on-failure

[testenv:docs-html]
deps = -r docs/requirements.txt
commands = sphinx-build -W -b html -d {envtmpdir}/doctrees docs {envtmpdir}/html

[testenv:coverage]
deps = coverage
skip_install = true
commands =
    coverage combine
    coverage html
    coverage report

[testenv:coverage-ci]
deps = coverage
skip_install = true
commands =
    coverage combine
    coverage xml
[testenv:docs]
deps = -r requirements/docs.txt
commands = sphinx-build -W -b html -d {envtmpdir}/doctrees docs {envtmpdir}/html

<MSG> drop support for Python 2 and 3.5

<DFF> @@ -1,38 +1,21 @@
 [tox]
 envlist =
-    py{37,36,35,27,py3,py}
+    py{38,37,36,py3}
     style
     docs
-    coverage
 skip_missing_interpreters = true
 
 [testenv]
 deps =
-    coverage
     pytest
     freezegun
-commands = coverage run -p -m pytest -Werror --tb=short --basetemp={envtmpdir} {posargs}
+commands = pytest --tb=short --basetemp={envtmpdir} {posargs}
 
 [testenv:style]
 deps = pre-commit
-skip_install = True
+skip_install = true
 commands = pre-commit run --all-files --show-diff-on-failure
 
-[testenv:docs-html]
+[testenv:docs]
 deps = -r docs/requirements.txt
 commands = sphinx-build -W -b html -d {envtmpdir}/doctrees docs {envtmpdir}/html
-
-[testenv:coverage]
-deps = coverage
-skip_install = true
-commands =
-    coverage combine
-    coverage html
-    coverage report
-
-[testenv:coverage-ci]
-deps = coverage
-skip_install = true
-commands =
-    coverage combine
-    coverage xml

drop support for Python 2 and 3.5