travis: Add travis_retry for android tests
travis: Add travis_retry for android tests

vsch/flexmark-java,jiakuan/commonmark-java,vsch/flexmark-java,vsch/commonmark-java,atlassian/commonmark-java,atlassian/commonmark-java,vsch/commonmark-java,vsch/flexmark-java,commonmark/commonmark-java,vsch/commonmark-java,vsch/flexmark-java,commonmark/commonmark-java,atlassian/commonmark-java,commonmark/commonmark-java,jiakuan/commonmark-java,jiakuan/commonmark-java