Add mypy to travis and as a dev dependency

Author: alejandrogallo

.travis.yml

@@ -13,5 +13,6 @@ install:
 
 script:
   - py.test --doctest-modules --cov=doi src tests
+  - mypy src/ tests
 after_success:
   - coveralls

setup.cfg

@@ -7,3 +7,18 @@ exclude = docs
 [tool:pytest]
 collect_ignore = ['setup.py']
 
+[mypy]
+disallow_redefinition = True
+warn_unused_configs = True
+disallow_any_generics = True
+disallow_subclassing_any = True
+disallow_untyped_calls = True
+disallow_untyped_defs = True
+disallow_incomplete_defs = True
+check_untyped_defs = True
+disallow_untyped_decorators = True
+no_implicit_optional = True
+warn_redundant_casts = True
+warn_unused_ignores = True
+warn_return_any = True
+no_implicit_reexport = True

setup.py

@@ -22,8 +22,9 @@ def get_version(filename):
 
 dev_requirements = [
     'coverage', 'pytest', 'pytest-cov==2.5.0', 'twine', 'pep8',
-    'flake8', 'wheel',
-    'sphinx', 'sphinx-autobuild', 'sphinx-autodoc-typehints', 'sphinx_rtd_theme']
+    'flake8', 'wheel', 'mypy',
+    'sphinx', 'sphinx-autobuild', 'sphinx-autodoc-typehints',
+    'sphinx_rtd_theme']
 
 version = get_version('./src/doi/__init__.py')