Change to Dropbox (to remove the Bintray rate limit) (#343)
Change to Dropbox (to remove the Bintray rate limit) (#343)

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