some manual python2 metadata cleanup

tox.ini

@@ -1,10 +1,9 @@
 [tox]
 minversion=2.3.1
-envlist = py27,py35,py36,py37,py38,flake8,linters,docs
+envlist = py36,py37,py38,flake8,linters,docs
 
 [testenv]
 deps =
-    mock>=2.0.0
     pytest!=3.0.5,!=5.2.3
     coverage
 commands =
@@ -14,14 +13,8 @@ commands =
     # ensure 100% coverage of tests
     coverage report --fail-under 100 --include tests/*
 
-[testenv:venv]
-deps =
-    .
-commands = {posargs}
-
 # Dogfood our current master version
 [testenv:dogfood]
-basepython = python3
 skip_install = true
 deps =
     wheel
@@ -33,7 +26,6 @@ commands =
 
 # Linters
 [testenv:flake8]
-basepython = python3
 skip_install = true
 deps =
     flake8
@@ -46,7 +38,6 @@ commands =
     flake8 src/flake8/ tests/ setup.py
 
 [testenv:pylint]
-basepython = python3
 skip_install = true
 deps =
     pyflakes
@@ -55,7 +46,6 @@ commands =
     pylint src/flake8
 
 [testenv:doc8]
-basepython = python3
 skip_install = true
 deps =
     sphinx
@@ -64,14 +54,12 @@ commands =
     doc8 docs/source/
 
 [testenv:pre-commit]
-basepython = python3
 skip_install = true
 deps = pre-commit
 commands =
     pre-commit run --all-files --show-diff-on-failure
 
 [testenv:bandit]
-basepython = python3
 skip_install = true
 deps =
     bandit
@@ -79,7 +67,6 @@ commands =
     bandit -r src/flake8/ -c .bandit.yml
 
 [testenv:linters]
-basepython = python3
 skip_install = true
 deps =
     {[testenv:flake8]deps}
@@ -96,7 +83,6 @@ commands =
 
 # Documentation
 [testenv:docs]
-basepython = python3
 deps =
     -rdocs/source/requirements.txt
 commands =
@@ -104,7 +90,6 @@ commands =
     sphinx-build -E -W -c docs/source/ -b man docs/source/ docs/build/man
 
 [testenv:serve-docs]
-basepython = python3
 skip_install = true
 changedir = docs/build/html
 deps =
@@ -112,7 +97,6 @@ commands =
     python -m http.server {posargs}
 
 [testenv:readme]
-basepython = python3
 deps =
     readme_renderer
 commands =
@@ -120,7 +104,6 @@ commands =
 
 # Release tooling
 [testenv:build]
-basepython = python3
 skip_install = true
 deps =
     wheel
@@ -129,7 +112,6 @@ commands =
     python setup.py -q sdist bdist_wheel
 
 [testenv:release]
-basepython = python3
 skip_install = true
 deps =
     {[testenv:build]deps}