Remove Travis CI config

Create Github Actions config
Split tox ini into one per supported distro so they can be run seperately

Signed-off-by: Adam Warner <me@adamwarner.co.uk>

test/setup.py

@@ -0,0 +1,6 @@
+from setuptools import setup
+
+setup(
+    setup_requires=['pytest-runner'],
+    tests_require=['pytest'],
+)