Add travis ci job for validating mypy type hints

ahawker · ahawker · commit afce856a68de · 2020-09-08T15:11:04.000-07:00
diff --git a/.travis.yml b/.travis.yml
@@ -6,6 +6,11 @@ python:
 - "3.5"
 - "3.6"
 - "pypy"
+jobs:
+  include:
+    - python: '3.6'
+      install: pip install mypy
+      script: mypy --strict usb1
 addons:
   apt:
     packages:
