Drop .travis.yml
Drop .travis.yml

It's not working. We don't have a `npm test` script to run. We want to
switch to Actions anyways. Let's make an issue to add GitHub Actions.

https://github.com/iFixit/pulldasher/issues/229

iFixit/pulldasher,iFixit/pulldasher,iFixit/pulldasher,iFixit/pulldasher