Added documentation for optional dependencies

CHANGELOG.rst

@@ -13,6 +13,7 @@ Features
 * (Python) Added autoapidecorator directive with Sphinx >= 2.0.
 * (Python) Can use autodoc_docstring_signature with Autodoc-style directives.
 * Made it more clear which file causes an error, when an error occurs.
+* Sphinx language domains are now optional dependencies.
 
 Bug Fixes
 ^^^^^^^^^

docs/tutorials.rst

@@ -11,7 +11,14 @@ you can following the :doc:`sphinx:usage/quickstart` guide in the Sphinx documen
 The recommended way of installing AutoAPI is through a `virtualenv <https://virtualenv.pypa.io/>`_.
 Once you have a virtualenv set up, you can install AutoAPI with the command::
 
-    pip install sphinx-autoapi
+==========   ==========================================================
+Language     Command
+==========   ==========================================================
+Python       ``pip install sphinx-autoapi``
+Go           ``pip install sphinx-autoapi[go]``
+Javascript   ``pip install sphinx-autoapi``
+.NET         ``pip install sphinx-autoapi[dotnet]``
+==========   ==========================================================
 
 Depending on which language you are trying to document,
 each language has a different set of steps for finishing the setup of AutoAPI:

tox.ini

@@ -16,11 +16,12 @@ python =
 [testenv]
 setenv =
     LANG=C
+extras =
+    dotnet
+    go
 deps = -r{toxinidir}/requirements.txt
     pytest
     mock
-    sphinxcontrib-golangdomain
-    sphinxcontrib-dotnetdomain
     sphinx16: Sphinx<1.7
     sphinx17: Sphinx<1.8
     sphinx18: Sphinx<1.9
@@ -31,12 +32,14 @@ commands =
 
 [testenv:formatting]
 basepython = python3
+skip_install = true
 deps =
     black
 commands =
     black --check autoapi tests
 
 [testenv:lint]
+skip_install = true
 deps =
     prospector
 commands =