ci: add set +u after sourced script to restore previous shell state
ci: add set +u after sourced script to restore previous shell state

See https://github.com/travis-ci/travis-ci/issues/5434 for details

JCMais/node-libcurl,JCMais/node-libcurl,JCMais/node-libcurl,JCMais/node-libcurl,JCMais/node-libcurl,JCMais/node-libcurl,JCMais/node-libcurl