Make the `pod lib lint` steps verbose.
Make the `pod lib lint` steps verbose.

When something fails, CocoaPods tends to print a short line about what failed,
but some times when `xcodebuild` fails, that isn't much detail, so just enable
the verbose flag so there is a better chance that the problem can be figured
out (or realized it is some Xcode flake).

thomasvl/gtm-session-fetcher,google/gtm-session-fetcher,google/gtm-session-fetcher,thomasvl/gtm-session-fetcher,google/gtm-session-fetcher,thomasvl/gtm-session-fetcher