Fix docs builds

docs/conf.py

@@ -18,9 +18,9 @@
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
-sys.path.insert(0, os.path.abspath('..'))
+sys.path.insert(0, os.path.abspath(os.path.join('..', 'src')))
 import marshmallow  # noqa
-from marshmallow.compat import OrderedDict
+from marshmallow.compat import OrderedDict  # noqa
 
 # -- General configuration -----------------------------------------------------
 

tox.ini

@@ -18,6 +18,7 @@ commands = pytest --ignore=tests/test_py3/ {posargs}
 [testenv:docs]
 deps = -rdocs/requirements.txt
 extras =
+skip_install = true
 commands = sphinx-build docs/ docs/_build {posargs}
 
 ; Below tasks are for development only (not run in CI)
@@ -27,7 +28,8 @@ deps =
   -rdocs/requirements.txt
   sphinx-autobuild
 extras =
-commands = sphinx-autobuild --open-browser docs/ docs/_build {posargs} -z marshmallow
+skip_install = true
+commands = sphinx-autobuild --open-browser docs/ docs/_build {posargs} -z src/marshmallow
 
 [testenv:watch-readme]
 deps = restview