Exercise 3: Package Version Rules — Possible Solution
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TASK
A package is at 1.3.2 and its author releases 1.4.0 and 2.0.0. Under "Up to
Next Major" and "Up to Next Minor," which versions would Xcode accept, and
what could the chapter not verify about how the result is recorded?

ANSWER
- Up to Next Major (starting at 1.3.2): updates until the first digit
  increases, so 1.4.0 is accepted and 2.0.0 is not.
- Up to Next Minor (starting at 1.3.2): stops when the middle number
  increases, so 1.4.0 is not accepted, and neither is 2.0.0. Only 1.3.x
  releases would be taken.

WHAT IS RECORDED
Package.resolved records the exact resolved version each time a package is
added or updated.

WHAT COULD NOT BE VERIFIED
Where Xcode stores Package.resolved for an app project, and whether it
should be committed to version control. The sources describe the file for a
Swift package's top-level directory.