TF 1.15 compatibility fix (#514)
TF 1.15 compatibility fix (#514)

This PR fixes a failed tests that works in 2.0 but failed in 0.8.

Once this PR is merged, R0.8 branch will be rebased.

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