update compat

.travis.yml

@@ -0,0 +1,37 @@
+language: python
+dist: xenial
+
+python:
+  - "3.6"
+  - "3.7"
+  - "3.8"
+  # TODO add 3.9
+  - "3.9-dev"
+
+install: pip install tox-travis tox tox-venv
+
+# Used by the `test` stage.
+script: tox
+
+stages:
+  - test
+  - lint
+
+jobs:
+  allow_failures:
+    - python: "3.9-dev"
+
+  include:
+
+    # The `test` stage using the `python` matrix defined above
+    # is included implicitly.
+
+    - stage: lint
+      name: "Code Linting"
+      python: "3.7"
+      script: TOXENV=lint tox
+
+    - stage: check-docs
+      name: "Docs check"
+      python: "3.7"
+      script: TOXENV=check-docs tox