add docs testenv

Author: espdev

.travis.yml

@@ -11,6 +11,8 @@ matrix:
       env: TOXENV=py38-pytest
     - python: "3.7"
       env: TOXENV=flake8
+    - python: "3.7"
+      env: TOXENV=docs
 
 install:
   pip install tox

tox.ini

@@ -14,6 +14,11 @@ commands =
     pytest --cov=click_option_group --color=yes -v {posargs}
     coveralls
 
+[testenv:docs]
+commands =
+    pip install -e .[docs]
+    make -C docs/ html
+
 [testenv:flake8]
 deps =
     flake8