Fix travisCI
Fix travisCI

It seems that oraclejdk8 is not working with the new images of travis
https://travis-ci.community/t/error-installing-oraclejdk8-expected-feature-release-number-in-range-of-9-to-14-but-got-8

mockito/mockito-kotlin,mockito/mockito-kotlin,nhaarman/mockito-kotlin,nhaarman/mockito-kotlin