Fix: incorrect expectation in a test for bob exercise

Pull Request: on gitHub at path exercism/swift/pull/645

The third requirement of the Bob exercise is:

  • Calm down, I know what I’m doing!” This is what he says if you yell a question at him.

So we need to fix the corresponding tests and the example file.

BREAKING CHANGE: This PR will break the current invalid solutions but all tests will pass as expected

Also checked the canonical-data for bob exercise and it seems that the Swift tests is not in sync with it.

Most Exercises aren’t synced, it is on my to-do list to create some tooling to automate that. That tool is still in quite early stages but I hope to increase the development speed. Meanwhile I appreciate your pr and will merge it, but as for the rest that will be fixed once I got some tooling up.