Configure Travis CI and CodeCov

Configure automated tests with Travis CI, and upload code coverage
reports to codecov.io

.travis.yml

@@ -0,0 +1,12 @@
+language: python
+python: 3.7
+dist: xenial
+sudo: true
+before_install:
+  - pip install codecov
+install:
+  - pip install -e .
+script:
+  - python setup.py test
+after_success:
+  - codecov

setup.cfg

@@ -2,4 +2,4 @@
 test=pytest
 
 [tool:pytest]
-addopts = --mypy
+addopts = --mypy --cov monads --cov-report xml:reports/coverage.xml

setup.py

@@ -3,6 +3,7 @@ from setuptools import setup  # type: ignore
 with open("README.md", "r") as f:
     long_description = f.read()
 
+
 setup(
     name="typesafe-monads",
     version="0.2",
@@ -14,7 +15,7 @@ setup(
     url="https://github.com/correl/typesafe-monads",
     packages=["monads"],
     setup_requires=["pytest-runner"],
-    tests_require=["pytest", "mypy", "pytest-mypy"],
+    tests_require=["pytest", "mypy", "pytest-cov", "pytest-mypy"],
     classifiers=[
         "Development Status :: 2 - Pre-Alpha",
         "Intended Audience :: Developers",