Add nightly Python build for Travis CI

diff --git a/.travis.yml b/.travis.yml
index 9095cf43352ee4500eb1f1b9036648a4bf991705..984be572c8f53817c37b9421818838bdb9baea77 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,8 +7,11 @@ python:
 - '3.6'
 - '3.7'
 - '3.8'
+- 'nightly'
 
 matrix:
+  allow_failures:
+    - python: 'nightly'
   fast_finish: true
 
 env: