[MARVIN-21] Travis CI sbt batch mode
Our Travis-CI failed while checking the latest master merge.
https://travis-ci.org/apache/incubator-marvin/jobs/470011726
By adding a `-batch` to sbt, the build should fail and start retrying right after sbt project loading fail.
diff --git a/.travis.yml b/.travis.yml
index 08689ac..3628d48 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -30,7 +30,7 @@
before_script:
- cd engine-executor
- unset SBT_OPTS
- script: travis_retry sbt ++$TRAVIS_SCALA_VERSION coverage test coverageReport
+ script: travis_retry sbt -batch ++$TRAVIS_SCALA_VERSION coverage test coverageReport
# Python Toolbox
# Python Toolbox - Linux
- language: python