travis-ci: Switch to bionic

Need to drop python 3.4 for that since it's not available on bionic.

diff --git a/.travis.yml b/.travis.yml
index 9eee95c80fcd491f773363d66c8fe0a1ab37d58d..90584befc137e043f59ca23cca3e176ccfbcb870 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,16 +4,11 @@ language: python
 
 services:
   - docker
+dist: bionic 
 
 python:
-  - "3.4"
-  - "3.5"
   - "3.6"
-matrix:
-  include:
-    - python: 3.7
-      dist: xenial
-      sudo: true
+  -  3.7
 
 before_install:
   - sudo apt-get -qq update