message: Explicitly testing 3.2 and 3.5 R versions on Travis
  This should be good for now.
diff: @@ -43,6 +43,15 @@ matrix:
  script:
  - bazel test -s --verbose_failures -- //tensorflow_io/... -//tensorflow_io/ignite:ignite_py_test
  - language: r
  + r:
  + - 3.2
  + before_install:
  + - cd R-package
  + script:
  + - R -e "devtools::test()"
  + - language: r
  + r:
  + - 3.5
  before_install:
  - cd R-package
  script:
  