Add .travis.yml for Travis-CI support.

.travis.yml

@@ -0,0 +1,11 @@
+language: python
+python:
+  - "3.8.0"
+before_install:
+  - python -m pip install --upgrade pip
+install:
+  - pip install -r dev-requirements.txt
+script:
+  - python -m pylint bfxapi
+  - python -m mypy bfxapi
+  - python -m unittest bfxapi.tests