Added Travis-CI config (amundsen-io#1)

Added Travis-CI configuration and mypy checks

.travis.yml

@@ -0,0 +1,8 @@
+dist: xenial
+language: python
+python: 3.7
+install:
+  - pip3 install -r requirements.txt
+  - python3 setup.py install
+script:
+  - make test

Makefile

@@ -11,5 +11,9 @@ test_unit:
 lint:
 	python3 -m flake8
 
+.PHONY: mypy
+mypy:
+	mypy --ignore-missing-imports --follow-imports=skip --strict-optional --warn-no-return metadata_service
+
 .PHONY: test
-test: test_unit lint
+test: test_unit lint mypy

requirements.txt

@@ -25,6 +25,11 @@ pytest-cov==2.5.1
 # Upstream url: https://mock.readthedocs.io/en/latest/
 mock==2.0.0
 
+# Mypy is an optional static type checker for Python.
+# License: MIT
+# Upstream url: https://github.com/python/mypy
+mypy==0.660
+
 # Thin-wrapper around the mock package for easier use with py.test.
 # License: MIT
 # Upstream url: https://pypi.python.org/pypi/pytest-mock