.travis.yml: The 'sudo' tag is now deprecated in Travis CI

[cclauss]

Travis are now recommending removing the sudo tag.

"If you currently specify sudo: false in your .travis.yml, we recommend removing that configuration"

[padamstx]

We currently use
sudo: required
Is there another way to specify this?

[cclauss]

Just remove the line because sudo is always available now in Travis.

[padamstx]

gotcha... thanks!

[padamstx]

This change has been completed via PR #25