Skip test on macOS, so that bazel cache could persist on Travis CI (#385)
Skip test on macOS, so that bazel cache could persist on Travis CI (#385)

Will revert back once cache persist on Travis CI

Signed-off-by: Yong Tang <765086fe2e0c1f980161f127fec596800f327f62@outlook.com>
tensorflow/io,tensorflow/io,tensorflow/io,tensorflow/io,tensorflow/io,tensorflow/io,tensorflow/io