Optimize tox config and add blackening

.gitignore

@@ -62,3 +62,4 @@ docs/_build/
 .qbcache/
 
 pytype_output/
+.pytype/

pyproject.toml

@@ -0,0 +1,19 @@
+[tool.black]
+line-length = 120
+skip-string-normalization = true
+target-version = ['py35', 'py36', 'py37']
+exclude = '''
+/(
+    \.eggs
+  | \.git
+  | \.hg
+  | \.mypy_cache
+  | \.tox
+  | \.venv
+  | _build
+  | buck-out
+  | build
+  | dist
+  | tests
+)/
+'''

tox.ini

@@ -1,14 +1,13 @@
 [tox]
-minversion = 1.7.2
-envlist = py3pylint, py3pytype, py35, py36, py37
+minversion = 3.15.0
+envlist = pylint, pytype, black, py35, py36, py37
 skip_missing_interpreters = true
 
 [testenv]
 deps =
     -rdev-requirements.txt
-    -rtest-requirements.txt
     codecov
-passenv = CI TRAVIS TRAVIS_*
+passenv = CI
 commands = pytest --cov-report term-missing --cov wryte tests -v
 
 [testenv:pywin]
@@ -19,12 +18,14 @@ deps =
 commands = pytest --cov-report term-missing --cov wryte tests -v
 passenv = ProgramFiles APPVEYOR LOGNAME USER LNAME USERNAME HOME USERPROFILE
 
-[testenv:py3pylint]
+[testenv:pylint]
 basepython = python3.7
-deps = pylint
 commands = pylint wryte.py
 
-[testenv:py3pytype]
+[testenv:pytype]
 basepython = python3.7
-deps = pytype
 commands = pytype wryte.py
+
+[testenv:black]
+basepython = python3.7
+commands = black . --check