Try workaround recommended here https://github.com/travis-ci/travis-ci/issues/9815

7 years ago · 3d40456e1a
1 changed files with 6 additions and 3 deletions
--- a/.travis.yml
+++ b/.travis.yml
@ -5,7 +5,12 @@ cache: pip
 python:
  - '2.7'
  - '3.6'
-  - '3.7'
+
+matrix:
+  include:
+  - python: 3.7
+    dist: xenial
+    sudo: true

 install:
  - pip install -U pip setuptools
@ -14,5 +19,3 @@ install:
 script:
  - python setup.py test
  - flake8 disco/
-
-dist: xenial