Fix tox config

tox.ini

@@ -3,7 +3,6 @@ envlist =
     docs
     js-firefox
     {py,js}-lint
-skipsdist = true
 
 [flake8]
 max-line-length = 120
@@ -16,25 +15,25 @@ exclude =
     docs
 
 [testenv:docs]
-basepython=python3
-changedir=docs
-commands=sphinx-build -W -b html -d _build/doctrees .  _build/html
-deps=.[docs]
+basepython = python3
+changedir = docs
+commands = sphinx-build -W -b html -d _build/doctrees .  _build/html
+extras = docs
 
 [testenv:js-firefox]
 setenv = MOZ_HEADLESS = 1
-basepython=python3
-commands=jasmine ci -b firefox
+basepython = python3
+commands = jasmine ci -b firefox
 deps=
     jasmine
     typing
 
 [testenv:py-lint]
-basepython=python
-commands=flake8
-deps=flake8
+basepython = python
+commands = flake8
+deps = flake8
 
 [testenv:js-lint]
 whitelist_externals = jshint
-basepython=python
-commands=jshint .
+basepython = python
+commands = jshint .