switch back to bionic

.travis.yml

@@ -1,5 +1,5 @@
 sudo: required
-dist: xenial
+dist: bionic
 
 language: bash
 
@@ -38,7 +38,6 @@ script:
   - sudo bash -c 'echo -e "[user]\n\tname = abc\n\temail = root@localhost.com" > /home/travis/.gitconfig'
   - sudo echo "Travis Banch = $TRAVIS_BRANCH"
   - sudo python3 setup.py sdist bdist_wheel
-
   - sudo time bash install --travis -b "$TRAVIS_BRANCH"
   - sudo time bash tests/travis.sh
   - sudo wo update --travis