[travis] Force dist to Ubuntu Trusty by default

According to https://blog.travis-ci.com/2019-04-15-xenial-default-build-environment Ubuntu Xenial is now default, but it lacks python 2.6, 3.2 and 3.3 support needed by tests
6 years ago · afd4985f72
parent 2c53c0ebc6
commit afd4985f72
1 changed files with 1 additions and 0 deletions
--- a/.travis.yml
+++ b/.travis.yml
@ -9,6 +9,7 @@ python:
  - "3.6"
  - "pypy"
  - "pypy3"
+dist: trusty
 env:
  - YTDL_TEST_SET=core
  - YTDL_TEST_SET=download