Included external library setup for Travis

[warheade]

Dear prof and friends,

I'm using Apache.Poi for some features of our project. I managed to make it work locally.

However, compilation fails when I pushed the changes for travis tests. The external library import is not detected and recognized by Travis.

May I ask how can I fix this issue?

Many thanks,
Wang Jiannan (Victor)

[chyeo]

you can try updating your build.gradle under the dependencies
compile group: 'org.apache.poi', name: 'poi', version: '4.0.1'

[warheade]

@chyeo Thank you!