fix appdirs dependency

setup.cfg

@@ -20,3 +20,32 @@ omit = /tests
 
 [coverage:html]
 directory = ./coverage
+
+[tox:tox]
+envlist =
+  py37
+  docs
+requires =
+  cx_Freeze
+
+[testenv:py37]
+deps =
+    pytest
+    cx_Freeze
+commands =
+    pytest -x --capture=sys --print -W ignore::DeprecationWarning {toxinidir}/tests
+
+[testenv:docs]
+skipsdist = True
+usedevelop = True
+changedir = doc/en
+deps =
+    cx_Freeze
+    attrs
+    more-itertools
+    PyYAML
+    sphinx
+    sphinxcontrib-trio
+
+commands =
+    sphinx-build -W -b html . _build