Remove tf.enable_eager_execution() in README.md
Remove tf.enable_eager_execution() in README.md

As TensorFlow moves to 2.0, eager execution is enabled by default
so there is no need to invoke `tf.enable_eager_execution()`
explicitly.

This PR removed tf.enable_eager_execution() from README.md

Signed-off-by: Yong Tang <765086fe2e0c1f980161f127fec596800f327f62@outlook.com>

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