Closes#1332.
This runs an ubuntu box with a swiftlint process and nothing else.
During implementing this same thing in the ZIP-321 library I found
that the Swift Package Plugin for Swiftlint did work after some
juggling, but it added a lot of build time to the main build job
so it delayed the CI for several minutes while a separate machine
would to the same chore more effectively and also in an isolated
way without mixing lint and build failures
Fix Travis CI builds
fix travis build
Fix Travis CI
fix travis
Fix Travis CI
Delete unneeded test
Change scheme
Fix Project file so that it compile and tests for Travis CI
restore Demo app scheme
fix dumb typo
Fix Tests. Add workflow
fix workflow for github action
blank line