Added black, mypy and pyright to tox list

Author: wolph

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py37, py38, py39, py310, pypy3, flake8, docs
+envlist = py37, py38, py39, py310, pypy3, flake8, docs, black, mypy, pyright
 skip_missing_interpreters = True
 
 [testenv]
@@ -21,12 +21,23 @@ basepython = python3
 deps = flake8
 commands = flake8 {toxinidir}/progressbar {toxinidir}/tests {toxinidir}/examples.py
 
+[testenv:mypy]
+changedir =
+basepython = python3
+deps = mypy
+commands = mypy {toxinidir}/progressbar
+
 [testenv:pyright]
 changedir =
 basepython = python3
 deps = pyright
 commands = pyright {toxinidir}/progressbar
 
+[testenv:black]
+basepython = python3
+deps = black
+commands = black --skip-string-normalization --line-length 79 {toxinidir}/progressbar
+
 [testenv:docs]
 changedir =
 basepython = python3