ci: Travis: re-add py38

Ref: https://github.com/encode/starlette/pull/547

diff --git a/.travis.yml b/.travis.yml
index 8410bdd7268d139c86794dec4a01fa98d75eb7cd..4f4ef5dc5cea0fa4dd320f2adedaba9beb955602 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,6 +6,7 @@ cache: pip
 python:
     - "3.6"
     - "3.7"
+    - "3.8-dev"
 
 install:
     - pip install -U -r requirements.txt