Clarify date range exception
Clarify date range exception

Clarified the messaging for selected date exceptions.
See:
https://github.com/square/android-times-square/commit/2bb367039b3cb93e6764e55835dc023df9f4fd77#diff-dc87f15abf4a4219a43e5789bcc3ddaaR430

aaronhe42/MonoDroid.TimesSquare,aaronhe42/MonoDroid.TimesSquare,grummbo/MonoDroid.TimesSquare,grummbo/MonoDroid.TimesSquare