Closes #134

.travis.yml

@@ -1,12 +1,10 @@
 language: python
+dist: xenial
 
 matrix:
-  fast_finish: true
   include:
     - python: 3.6
-    - python: 3.7
-      dist: xenial
-      sudo: true
+    - python: 3.7.3
 
 
 before_install:

returns/maybe.py

@@ -8,6 +8,7 @@
     Callable,
     Coroutine,
     Generic,
+    NoReturn,
     Optional,
     TypeVar,
     Union,
@@ -224,7 +225,7 @@ def Some(inner_value: Optional[_ValueType]) -> Maybe[_ValueType]:  # noqa: N802
 
 
 #: Public unit value of protected `_Nothing` type.
-Nothing: Maybe[Any] = _Nothing()
+Nothing: Maybe[NoReturn] = _Nothing()
 
 
 @overload

setup.cfg

@@ -2,12 +2,8 @@
 # Read more about `setup.cfg`:
 # https://docs.python.org/3/distutils/configfile.html
 
-[bdist_wheel]
-universal = 1
-
 
 [coverage:run]
-branch = True
 omit =
   # We test mypy plugins with `pytest-mypy-plugins`,
   # which does not work with coverage:
@@ -53,7 +49,7 @@ per-file-ignores =
 
 [tool:pytest]
 # py.test options:
-norecursedirs = tests/fixtures *.egg .eggs dist build docs .tox .git __pycache__
+norecursedirs = *.egg .eggs dist build docs .tox .git __pycache__
 
 # You will need to measure your tests speed with `-n auto` and without it,
 # so you can see whether it gives you any performance gain, or just gives
@@ -63,6 +59,7 @@ addopts =
   --cov=returns
   --cov-report=term:skip-covered
   --cov-report=html
+  --cov-branch
   --cov-fail-under=100
   --mypy-ini-file=setup.cfg
 
@@ -77,8 +74,7 @@ line_length = 79
 
 
 [mypy]
-# The mypy configurations: http://bit.ly/2zEl9WI
-python_version = 3.6
+# mypy configurations: http://bit.ly/2zEl9WI
 
 # Plugins, includes custom:
 plugins =