travis: use default Ruby version unless defined explicitly
@@ -107,7 +107,7 @@ env:
- S3_JOB_DIR="$TRAVIS_COMMIT"/"$TRAVIS_OS_NAME"
- S3_DEPLOY_DIR="$TRAVIS_REPO_SLUG"/"$TRAVIS_BRANCH"
- QTDIR="$HOME/Qt5.13.2/5.13.2/clang_64"
- - RHO_RUBY="${RHO_RUBY:=2.7.0}"
+ - RHO_RUBY="${RHO_RUBY:=RUBY_VERSION}"
- ANDROID_ABIS="${ANDROID_ABIS:=arm,aarch64}"
#osx_image: xcode9.1
