Travis: remove obsolete option

The container builds are deprecated:
https://changelog.travis-ci.com/the-container-based-build-environment-is-fully-deprecated-84517

diff --git a/.travis.yml b/.travis.yml
index 7029641..7245aff 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,7 +6,6 @@ env:
    # via the "travis encrypt" command using the project repo's public key
    - secure: "ZdWWp0XX3C4sLIp4lqeQTWC7vt+GsWjmyRiD17T9833NBAW4dddz310I6iyeXe6oX09ZFFiVIN4ogx9ANcNBx9jriGXI2/82nBhpxOJBebet8JCNS5VeTr4rDSfQOKP+Oc+ko5KbbghTuAtO2CFYiH3jZUcn4TdsYbVanf+TwUs="
 
-sudo: required
 dist: trusty
 os:
   - linux