Run doctests in ci

Author: python-desert

.travis.yml

@@ -17,7 +17,7 @@ matrix:
       dist: xenial
       sudo: required
       env:
-        - TOXENV=py37,report,codecov
+        - TOXENV=py37,report,codecov,doc
 before_install:
   - python --version
   - uname -a

tox.ini

@@ -60,7 +60,7 @@ deps =
     pyenchant
 
 [testenv:doc]
-basepython=python3.6
+basepython=python3.7
 deps =
     -r{toxinidir}/docs/requirements.txt