[*] updated appintro dependency to v4.0.0 for UsingAppintro
[*] updated appintro dependency to v4.0.0 for UsingAppintro

nisrulz/android-examples,nisrulz/android-examples,nisrulz/android-examples,nisrulz/android-examples,nisrulz/android-examples,nisrulz/android-examples