Travis CI: Remove sudo: false

[ntwb]

Supersedes #30

This is a test to switch from Container-Based Builds to Virtual-Machine-Based

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Via: https://blog.travis-ci.com/2018-11-19-required-linux-infrastructure-migration

Over the next few weeks, we encourage everyone to remove any sudo: false configurations from your .travis.yml. Soon we will run all projects on the virtual-machine-based infrastructure, the sudo keyword will be fully deprecated.

The timeline for this migration will be as follows:

• 19 November, 2018 - Today we publish this post and are ready to answer all your questions!
• 28 November, 2018 - We will send a service email to remind folks still using sudo: false on recent builds to remind you to migrate.
• 03 December, 2018 - We will start randomly sampling projects on both travis-ci.org and travis-ci.com to move them permanently to using the virtual-machine-based infrastructure for all builds. The projects will be migrated incrementally over a few days
• 07 December, 2018 - All projects that use a Linux build environment will be fully migrated to using the same Linux infrastructure, which runs builds in virtual-machines.

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