Travis CI: 'sudo' tag is now deprecated in Travis

cclauss · web-flow · commit 2395d6bd39f8 · 2019-01-15T12:15:40.000+01:00
[Travis are now recommending removing the __sudo__ tag](https://blog.travis-ci.com/2018-11-19-required-linux-infrastructure-migration).
diff --git a/.travis.yml b/.travis.yml
@@ -9,10 +9,8 @@ matrix:
   include:
     - python: 3.7
       dist: xenial
-      sudo: required
     - python: "nightly"
       dist: xenial
-      sudo: required
   allow_failures:
     - python: "nightly"
 git:
