Fix wrong content-type when uploading artifacts to bintray
Fix wrong content-type when uploading artifacts to bintray

Aluxian/Messenger-for-Desktop,rafael-neri/whatsapp-webapp,Aluxian/Facebook-Messenger-Desktop,rafael-neri/whatsapp-webapp,Aluxian/Facebook-Messenger-Desktop,Aluxian/Messenger-for-Desktop,Aluxian/Messenger-for-Desktop,Aluxian/Facebook-Messenger-Desktop,rafael-neri/whatsapp-webapp